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There are articles on the Internet (I remember seeing at least one on this site) about that, with code.
The case of a circle is relatively easy, mostly a task in converting polar to Cartesian geometry. Break your text into letters and determine the angle for each letter based on the tangent at that point.
The hard part isn't making your text fit on a circle, but the leading between letters. If you're using a variable pitch font, how good the text looks is largely about pair kerning between letters. It's about combinations like "oo" and "oi" not having the same spacing. TrueType contains some hinting, so maybe there's some way to tap into that and pull out instructions from there.
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GraphicsPath will do that for you 
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Thank you!!
Also how could I have a text "fill" of a circle, instead of the rectangle? Can this be done with graphics path?
cheers
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just that ...¿?
BiGjOe
Passez Ce Qu'il Passe
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Wiki, as usual.
This technique can be applied to all programming languages. Do you have any C# specific question?
modified 12-Sep-18 21:01pm.
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hellow to all
i am new to C# i tried to make a Model like in VB.NET where i can put variable there and all the forums can read them , or write a public function but i couldn't , what method in C# replace what i am trying to do ?
where can i find good articls to study moveing from VB.NET to C# ?
thank to all for anyhelp ...
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hi there is no (modul) in c# !! try to implement public static (shared in vb.net) the following likns will help you
1 http://www.kamalpatel.net/ConvertCSharp2VB.aspx
2 http://www.developerfusion.co.uk/utilities/convertvbtocsharp.aspx
Tamimi - Code
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The on-line converters mentioned in the other post have serious shortcomings such as not handling generics, see the following for a full list http://www.tangiblesoftwaresolutions.com/Articles/Language%20Features%20not%20Handled%20by%20On-Line%20Converters.htm[^]
The demo of our Instant C# converter will be more useful as it actually converts VB.NET code (2005 or not).
David Anton
www.tangiblesoftwaresolutions.com
Instant C#: VB to C# converter
Instant VB: C# to VB converter
Instant C++: C# to C++ converter and VB to C++ converter
Instant J#: VB to J# converter
Clear VB: Cleans up VB.NET code
Clear C#: Cleans up C# code
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I would like my treeview to remember if the user had a node expanded or not
previous to a refresh. I have found the method expand(), which I think will
do this, but I'am having problems implementing it.
The code compiles but I get runtime exceptions when I launch the application.
Bottom line question,
How do you properly implement treeview.expand()?
Cheers,
-t-
-- modified at 10:51 Sunday 4th June, 2006
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if you want to add from serverXml to PcXml according to your conditions :-
private void AddRow()
{
DataSet serverXml = new DataSet();
serverXml.ReadXml("ServerXml.xml");
DataSet pcXml = new DataSet();
pcXml.ReadXml("PcXml.xml");
foreach(DataRow newRow in serverXml.Tables[0].Rows)
{
string ID = newRow["ID"].ToString();
DataRow [] TempPcRows = pcXml.Tables[0].Select("id= " + ID);
if(TempPcRows.Length != 0)
{
TempPcRows[0].ItemArray =
}
else
{
pcXml.Tables[0].ImportRow(newRow);
}
}
pcXml.WriteXml("PCXml.xml");
Tamimi - Code
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Hi Tamimi - Code,
I thank you very much for your reply!
I don't see this foreach statement: foreach (DataRow serverRow in serverXML.Tables[0].Rows) , which i had in my previous code. Does that mean i don't need that statement?
Because i can't figure out what i should be putting behind this line:
TempPcRows[0].ItemArray =
Hope you can tell me that Tamimi.
Thanks in advance!
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sorry 
here is the complete line
TempPcRows[0].ItemArray = newRow.ItemArray;
Tamimi - Code
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Thank you Tamimi - Code!
You have no idea how greatfull i am!
You're the greatest ! ! !
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Not sure if you understand my question?
Appreciate the effort though...
I'm not doing anything with XML
This is just a simple treeview within a form
It's a continuation from some sample code from
a O'Riely book on c#
I have tried to put it in the expand method where
the code fills the directory with no success?
Don't know how to attach so
I will just paste what I have so far:
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
namespace FileCopier
{
///
/// Summary description for Form1.
///
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TreeView tvwSource;
private System.Windows.Forms.TreeView tvwTargetDir;
private System.Windows.Forms.Button btnClear;
private System.Windows.Forms.CheckBox chkOverwrite;
private System.Windows.Forms.Button btnCancel;
private System.Windows.Forms.Button btnCopy;
private System.Windows.Forms.Label lblStatus;
private System.Windows.Forms.Button btnDelete;
private System.Windows.Forms.TextBox txtTargetDir;
private System.Windows.Forms.Label lblSource;
private System.Windows.Forms.Label lblTarget;
private System.ComponentModel.Container components = null;
public class FileComparer : IComparer
{
public int Compare (object f1, object f2)
{
FileInfo file1 = (FileInfo) f1;
FileInfo file2 = (FileInfo) f2;
if (file1.Length > file2.Length)
{
return -1;
}
if (file1.Length < file2.Length)
{
return 1;
}
return 0;
}
}
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
// fill the source and target directory trees
FillDirectoryTree(tvwSource, true);
FillDirectoryTree(tvwTargetDir, false);
}
///
/// Fill the directory tree for either the Source or
/// Target TreeView.
///
private void FillDirectoryTree(
TreeView tvw, bool isSource)
{
// Populate tvwSource, the Source TreeView,
// with the contents of
// the local hard drive.
// First clear all the nodes.
tvw.Nodes.Clear();
// Get the logical drives and put them into the
// root nodes. Fill an array with all the
// logical drives on the machine.
string[] strDrives = Environment.GetLogicalDrives();
// Iterate through the drives, adding them to the tree.
// Use a try/catch block, so if a drive is not ready,
// e.g. an empty floppy or CD,
// it will not be added to the tree.
foreach (string rootDirectoryName in strDrives)
{
if (rootDirectoryName != @"C:\")
continue;
try
{
// Fill an array with all the first level
// subdirectories. If the drive is
// not ready, this will throw an exception.
DirectoryInfo dir =
new DirectoryInfo(rootDirectoryName);
dir.GetDirectories();
TreeNode ndRoot = new TreeNode(rootDirectoryName);
// Add a node for each root directory.
tvw.Nodes.Add(ndRoot);
// Add subdirectory nodes.
// If Treeview is the source,
// then also get the filenames.
if (isSource)
{
GetSubDirectoryNodes(
ndRoot, ndRoot.Text, true);
}
else
{
GetSubDirectoryNodes(
ndRoot, ndRoot.Text, false);
}
}
// Catch any errors such as
// Drive not ready.
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}
} // close for FillSourceDirectoryTree
///
/// Gets all the subdirectories below the
/// passed in directory node.
/// Adds to the directory tree.
/// The parameters passed in at the parent node
/// for this subdirectory,
/// the full path name of this subdirectory,
/// and a Boolean to indicate
/// whether or not to get the files in the subdirectory.
///
private void GetSubDirectoryNodes(
TreeNode parentNode, string fullName, bool getFileNames)
{
DirectoryInfo dir = new DirectoryInfo(fullName);
DirectoryInfo[] dirSubs = dir.GetDirectories();
// Add a child node for each subdirectory.
foreach (DirectoryInfo dirSub in dirSubs)
{
// do not show hidden folders
if ( (dirSub.Attributes & FileAttributes.Hidden)
!= 0 )
{
continue;
}
///
/// Each directory contains the full path.
/// We need to split it on the backslashes,
/// and only use
/// the last node in the tree.
/// Need to double the backslash since it
/// is normally
/// an escape character
///
TreeNode subNode = new TreeNode(dirSub.Name);
parentNode.Nodes.Add(subNode);
// Call GetSubDirectoryNodes recursively.
GetSubDirectoryNodes(
subNode,dirSub.FullName,getFileNames);
}
if (getFileNames)
{
// Get any files for this node.
FileInfo[] files = dir.GetFiles();
// After placing the nodes,
// now place the files in that subdirectory.
foreach (FileInfo file in files)
{
TreeNode fileNode = new TreeNode(file.Name);
parentNode.Nodes.Add(fileNode);
}
}
}//close for private void GetSubDirectoryNodes
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
this.lblSource = new System.Windows.Forms.Label();
this.lblTarget = new System.Windows.Forms.Label();
this.btnClear = new System.Windows.Forms.Button();
this.btnCopy = new System.Windows.Forms.Button();
this.btnDelete = new System.Windows.Forms.Button();
this.btnCancel = new System.Windows.Forms.Button();
this.chkOverwrite = new System.Windows.Forms.CheckBox();
this.txtTargetDir = new System.Windows.Forms.TextBox();
this.tvwSource = new System.Windows.Forms.TreeView();
this.tvwTargetDir = new System.Windows.Forms.TreeView();
this.lblStatus = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// lblSource
//
this.lblSource.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, ((System.Drawing.FontStyle)((System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Underline))), System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblSource.Location = new System.Drawing.Point(100, 25);
this.lblSource.Name = "lblSource";
this.lblSource.Size = new System.Drawing.Size(150, 23);
this.lblSource.TabIndex = 0;
this.lblSource.Text = "Source Files";
this.lblSource.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// lblTarget
//
this.lblTarget.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, ((System.Drawing.FontStyle)((System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Underline))), System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblTarget.Location = new System.Drawing.Point(400, 25);
this.lblTarget.Name = "lblTarget";
this.lblTarget.Size = new System.Drawing.Size(175, 23);
this.lblTarget.TabIndex = 1;
this.lblTarget.Text = "Target Directory";
this.lblTarget.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// btnClear
//
this.btnClear.Location = new System.Drawing.Point(125, 450);
this.btnClear.Name = "btnClear";
this.btnClear.Size = new System.Drawing.Size(100, 23);
this.btnClear.TabIndex = 2;
this.btnClear.Text = "Clear";
this.btnClear.Click += new System.EventHandler(this.btnClear_Click);
//
// btnCopy
//
this.btnCopy.Location = new System.Drawing.Point(550, 450);
this.btnCopy.Name = "btnCopy";
this.btnCopy.TabIndex = 3;
this.btnCopy.Text = "Copy";
this.btnCopy.Click += new System.EventHandler(this.btnCopy_Click);
//
// btnDelete
//
this.btnDelete.Location = new System.Drawing.Point(550, 500);
this.btnDelete.Name = "btnDelete";
this.btnDelete.TabIndex = 4;
this.btnDelete.Text = "Delete";
this.btnDelete.Click += new System.EventHandler(this.btnDelete_Click);
//
// btnCancel
//
this.btnCancel.Location = new System.Drawing.Point(550, 550);
this.btnCancel.Name = "btnCancel";
this.btnCancel.TabIndex = 5;
this.btnCancel.Text = "Cancel";
this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
//
// chkOverwrite
//
this.chkOverwrite.Location = new System.Drawing.Point(425, 425);
this.chkOverwrite.Name = "chkOverwrite";
this.chkOverwrite.Size = new System.Drawing.Size(115, 24);
this.chkOverwrite.TabIndex = 6;
this.chkOverwrite.Text = "Overwrite if exists";
//
// txtTargetDir
//
this.txtTargetDir.Location = new System.Drawing.Point(350, 50);
this.txtTargetDir.Name = "txtTargetDir";
this.txtTargetDir.Size = new System.Drawing.Size(275, 20);
this.txtTargetDir.TabIndex = 7;
this.txtTargetDir.Text = "";
//
// tvwSource
//
this.tvwSource.CheckBoxes = true;
this.tvwSource.ImageIndex = -1;
this.tvwSource.Location = new System.Drawing.Point(50, 50);
this.tvwSource.Name = "tvwSource";
this.tvwSource.SelectedImageIndex = -1;
this.tvwSource.Size = new System.Drawing.Size(250, 375);
this.tvwSource.TabIndex = 8;
this.tvwSource.AfterCheck += new System.Windows.Forms.TreeViewEventHandler(this.tvwSource_AfterCheck);
//
// tvwTargetDir
//
this.tvwTargetDir.ImageIndex = -1;
this.tvwTargetDir.Location = new System.Drawing.Point(350, 75);
this.tvwTargetDir.Name = "tvwTargetDir";
this.tvwTargetDir.SelectedImageIndex = -1;
this.tvwTargetDir.Size = new System.Drawing.Size(275, 350);
this.tvwTargetDir.TabIndex = 9;
this.tvwTargetDir.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.tvwTargetDir_AfterSelect);
//
// lblStatus
//
this.lblStatus.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblStatus.Location = new System.Drawing.Point(50, 500);
this.lblStatus.Name = "lblStatus";
this.lblStatus.TabIndex = 0;
this.lblStatus.Text = "Status:";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(667, 591);
this.Controls.Add(this.tvwTargetDir);
this.Controls.Add(this.tvwSource);
this.Controls.Add(this.txtTargetDir);
this.Controls.Add(this.chkOverwrite);
this.Controls.Add(this.btnCancel);
this.Controls.Add(this.btnDelete);
this.Controls.Add(this.btnCopy);
this.Controls.Add(this.btnClear);
this.Controls.Add(this.lblTarget);
this.Controls.Add(this.lblSource);
this.Controls.Add(this.lblStatus);
this.Name = "Form1";
this.Text = "File Copier";
this.ResumeLayout(false);
}
#endregion
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
///
/// on cancel, exit
///
private void btnCancel_Click(object sender, System.EventArgs e)
{
Application.Exit();
}
///
/// recursively set or clear check marks
///
private void SetCheck(TreeNode node, bool check)
{
// find all the child nodes from this node
foreach (TreeNode n in node.Nodes)
{
n.Checked = check; // check the node
// if this is a node in the tree, recurse
if (n.Nodes.Count != 0)
{
SetCheck(n,check);
}
}
}
///
/// Given a node and an array list
/// fill the list with the names of
/// all the checked files
///
// Fill the ArrayList with the full paths of
// all the files checked
private void GetCheckedFiles(TreeNode node,
ArrayList fileNames)
{
// if this is a leaf...
if (node.Nodes.Count == 0)
{
// if the node was checked...
if (node.Checked)
{
// get the full path and add it to the arrayList
string fullPath = GetParentString(node);
fileNames.Add(fullPath);
}
}
else // if this node is not a leaf
{
// if this node is not a leaf
foreach (TreeNode n in node.Nodes)
{
GetCheckedFiles(n,fileNames);
}
}
}
///
/// Given a node, return the
/// full path name
///
private string GetParentString(TreeNode node)
{
// if this is the root node (c:\) return the text
if(node.Parent == null)
{
return node.Text;
}
else
{
// recurse up and get the path then
// add this node and a slash
// if this node is the leaf, don't add the slash
return GetParentString(node.Parent) + node.Text +
(node.Nodes.Count == 0 ? "" : "\\");
}
}
///
/// shared by delete and copy
/// creates an ordered list of all
/// the selected files
///
private ArrayList GetFileList()
{
// create an unsorted array list of the full file names
ArrayList fileNames = new ArrayList();
// fill the fileNames ArrayList with the
// full path of each file to copy
foreach (TreeNode theNode in tvwSource.Nodes)
{
GetCheckedFiles(theNode, fileNames);
}
// Create a list to hold the FileInfo objects
ArrayList fileList = new ArrayList();
// for each of the file names we have in our unsorted list
// if the name corresponds to a file (and not a directory)
// add it to the file list
foreach (string fileName in fileNames)
{
// create a file with the name
FileInfo file = new FileInfo(fileName);
// see if it exists on the disk
// this fails if it was a directory
if (file.Exists)
{
// both the key and the value are the file
// would it be easier to have an empty value?
fileList.Add(file);
}
}
// Create an instance of the IComparer interface
IComparer comparer = (IComparer) new FileComparer();
// pass the comparer to the sort method so that the list
// is sorted by the compare method of comparer.
fileList.Sort(comparer);
return fileList;
}
/*
private void tvwSource_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
SetCheck(e.Node,e.Node.Checked);
Application.DoEvents();
}
*/
private void tvwSource_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
SetCheck(e.Node,e.Node.Checked);
}
///
/// Tell the root of each tree to uncheck
/// all the nodes below
///
private void btnClear_Click(object sender, System.EventArgs e)
{
// get the top most node for each drive
// and tell it to clear recursively
foreach (TreeNode node in tvwSource.Nodes)
{
SetCheck(node, false);
}
}
///
/// Create an ordered list of all
/// the selected files, copy to the
/// target directory
///
private void btnCopy_Click(object sender, System.EventArgs e)
{
// get the list
ArrayList fileList = GetFileList();
// copy the files
foreach (FileInfo file in fileList)
{
try
{
// update the label to show progress
lblStatus.Text = "Copying " + txtTargetDir.Text +
"\\" + file.Name + "...";
Application.DoEvents();
// copy the file to its destination location
file.CopyTo(txtTargetDir.Text + "\\" +
file.Name,chkOverwrite.Checked);
}
catch (Exception ex)
{
// you may want to do more than
// just show the message
MessageBox.Show(ex.Message);
}
}
lblStatus.Text = "Done.";
FillDirectoryTree(tvwSource, true);
FillDirectoryTree(tvwTargetDir, false);
Application.DoEvents();
}
///
/// check that the user does want to delete
/// Make a list and delete each in turn
///
private void btnDelete_Click(object sender, System.EventArgs e)
{
// ask them if they are sure
System.Windows.Forms.DialogResult result =
MessageBox.Show(
"Are you quite sure?", // msg
"Delete Files", // caption
MessageBoxButtons.OKCancel, // buttons
MessageBoxIcon.Exclamation, // icons
MessageBoxDefaultButton.Button2); // default button
// if they are sure...
if (result == System.Windows.Forms.DialogResult.OK)
{
// iterate through the list and delete them.
// get the list of selected files
ArrayList fileNames = GetFileList();
foreach (FileInfo file in fileNames)
{
try
{
// update the label to show progress
lblStatus.Text = "Deleting " +
txtTargetDir.Text + "\\" +
file.Name + "...";
Application.DoEvents();
// Danger Will Robinson!
file.Delete();
}
catch (Exception ex)
{
// you may want to do more than
// just show the message
MessageBox.Show(ex.Message);
}
}
lblStatus.Text = "Done.";
FillDirectoryTree(tvwSource, true);
FillDirectoryTree(tvwTargetDir, false);
Application.DoEvents();
}
}
///
/// Get the full path of the chosen directory
/// copy it to txtTargetDir
///
private void tvwTargetDir_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
// get the full path for the selected directory
string theFullPath = GetParentString(e.Node);
// if it is not a leaf, it will end with a back slash
// remove the backslash
if (theFullPath.EndsWith("\\"))
{
theFullPath = theFullPath.Substring(0,theFullPath.Length-1);
}
// insert the path in the text box
txtTargetDir.Text = theFullPath;
}
}//close for public class Form1 : System.Windows.Forms.Form
}//close for namespace FileCopier
/* <eof> */
-t-
-- modified at 22:25 Sunday 4th June, 2006
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this is the error :System.Data.Odbc.OdbcException: ERROR [07002] [Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 1.
The query:
dbcComm.CommandText = "SELECT studenti.user_name,studenti.Nume, " +
"studenti.Prenume, cursuri.denumire_curs, note.nota, note.data " +
"FROM studenti INNER JOIN (cursuri INNER JOIN [note] ON " +
"cursuri.id_curs = note.id_curs) ON (studenti.id_stud = note.id_stud)"+
"WHERE studenti.user_name= "+user.ToString();
i want the query to select only those students(=studenti in my language :p) with that user name which i have store in my user variable
it works fine without the WHERE clause but it displays all students then
Thanks
TheBeginner
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You need to add quotes around the user_name because it is a string:
dbcComm.CommandText = "SELECT studenti.user_name,studenti.Nume, " +
"studenti.Prenume, cursuri.denumire_curs, note.nota, note.data " +
"FROM studenti INNER JOIN (cursuri INNER JOIN [note] ON " +
"cursuri.id_curs = note.id_curs) ON (studenti.id_stud = note.id_stud)"+
"WHERE studenti.user_name= '"+user.ToString()+"'";
note:
It's much better to use parameterized query to avoid SQL injection.
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Hi
You need to put quotes around your literal:
"WHERE studenti.user_name= '" + user.ToString() + "'";
You might consider actually using a parameter here - it's good practice 
----------------------------
Be excellent to each other
EasiReports[^] My free reporting component for WinForms.
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is there any way to read and write COM PORT through c#
please help me if any one know it
thanks
raj
india
link
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mohdmeraj wrote: very very urgent
mohdmeraj wrote: is there any way to read and write COM PORT through c#
Yes.
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i use "Select * from tableName Where joinDate >= '02/05/2006' And joinDate <= '15/05/2006'".
it does not work but why, i use sql server.
plz help me.
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what do you mean by its not work ??
Tamimi - Code
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i mean, it does not return any row but the table contains those type of row which satisfied this condition( joinDate >= '02/05/2006' And joinDate <= '15/06/2006')
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try to excute your query in the query analyzer and see what happen.
if its work take a look to your code.
Tamimi - Code
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sql won't recognise 02/05/2006! this is just a string and not a date.. Maybe this works 1900-01-04 00:00:00.000 but the safest way is to use an explicit cast like this CAST('1900-01-04 08:00' AS datetime)
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