Re: Custom Validation For TextBox - C# Discussion Boards

Is there a way to make it just show the major/minor version? Or only the build number?

Version ver = new Version(Application.ProductVersion);
string s = String.Format("v. {0:#}.{1:#}.{2:#}.{3:#}", ver.Major, ver.Minor, ver.Build, ver.Revision);

Check out the Version class in Help for more info.

I have CodeObjectList class in which I implmeneted IBindingList, ITypedList, IComponent, IListSource

When I do this

(ComboBox named cboCode)
(cList is the above class)

cboCode.DataSource = cList;
cboCode.DisplayMember = "Description";

it works fine

but

cboCode.DataBindings.Add("Text", cList, "Description");

the it just shows the first item as text and no drop down menu selections.

How come, how do I modify it to use the data bindings collection?

thanks
nick

is it possible to compile with VS. NET for the .NET 1.1 and with VS 2003 for .NET 1.0?

if it is possible, how can I use .NET 1.1 with VS.NET? or the upgrade is obligatory

Zibar wrote:
is it possible to compile with VS. NET for the .NET 1.1 and with VS 2003 for .NET 1.0?

No

Mazy

No sig. available now.

this is stupid... pushing technology forward is good but forcing people to do it is not.

Everyone,
I need some advice for a validating a textbox. I need to make sure the textbox is not empty with a custom validation form object. The custom validation is a requirement because I dont want to check the text box if it is not visible. Thanks in advance.

Courtney

Well, you could derive your own textbox and override the OnValidating method to perform validation...or you could have a normal textbox and subscribe to it's Validating event and perform validation that way.

Basically you have:

Way 1)

public class ValidTexbox : TextBox 
{
    protected override void OnValidating(CancelEventArgs e)
    {
        base.OnValidating (e);
        if(this.Visible == true && this.Text.Length == 0) 
        {
            e.Cancel = true;
            MessageBox.Show("Input invalid"); //notify the user that it can't be empty
        }
    }
}

Or

Way 2)

public class Form1 : System.Windows.Forms.Form
{
    private System.Windows.Forms.TextBox textBox1;
    private System.ComponentModel.Container components = null;
    public Form1()
    {
        InitializeComponent();
    }
	
    private void InitializeComponent()
    {
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.SuspendLayout();
        // 
        // textBox1
        // 
        this.textBox1.Location = new System.Drawing.Point(8, 16);
        this.textBox1.Name = "textBox1";
        this.textBox1.TabIndex = 0;
        this.textBox1.Text = "textBox1";
        this.textBox1.Validating += new System.ComponentModel.CancelEventHandlerthis.textBox1_Validating);
        // 
        // Form1
        // 
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.textBox1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.ResumeLayout(false);
    }

    private void textBox1_Validating(object sender, System.ComponentModel.CancelEventArgs e)
    {
        if(textBox1.Visible == true && textBox1.Text.Length == 0) 
        {
            MessageBox.Show("Input invalid"); //notify the user that it can't be empty
        }
    }
}

Either way, you have to have the CausesValidation property of the textbox set to true. Then it'll work just fine. Smile | :)

Hawaian shirts and shorts work too in Summer.
People assume you're either a complete nut (in which case not a worthy target) or so damn good you don't need to worry about camouflage...
-Anna-Jayne Metcalfe on Paintballing

hello!

I have a problem with the forms designer of VSNet 2003. I created a
user control that loads some pictures located in the working directory
(in my case, it's something like C:\myproj\sources\exe) - I'm using
the Directory.GetCurrentDirectory to get the full pathname. The
control constructor calls a method that loads the pictures and I
override the Paint method, it renders the pictures.

Now, if I add my control in the main form, the designer complains
about the files path : an exception is launched, it says the files
could not be found in C:\myproj\sources. I'd like to know :

- how to force the designer to look for files IN the working directory
or any directory. I looked around in VSnet but couldn't find any
dialog box with such parameters. The designer just doesn't want to
know about the working directory.

- if this solution is not possible, how to avoid the "execution" of
the control in the designer (ie. just a frame with the background
color, not all pictures, that's it...no call to the Paint method)

Thanks if you can point me to some tricks about that.

nobody had this problem ? Cry | :((

Using the form's Focused property.

For instance

if(this.Focused==true)
{
    //Do Something
}

Have you tried using the Activated and Deactivate events along with a boolean variable.

But the definition for a top-most window is a form that overlaps all the other forms even if it is not the active one.

What do you want: The active window or the top-most window?

Inside C# you have the topmost property. Otherwise you can use WIN32 API

apferreira wrote:
Inside C# you have the topmost property.

The topmost window makes the window be always-on-top, and is equivalent to:

SetWindowPos(this.Handle, HWND_TOPMOST,0,0,0,0,
             SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);

It does NOT tell you whether your form is top in the ZOrder.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Use the GetWindow() API:

bool IsTopWindow=(GetWindow((IntPtr)0,GW_HWNDFIRST)==this.Handle);

The API is declared like this:

[DllImport("user32.dll")]
private static extern IntPtr GetWindow(IntPtr hwnd,
                                    int flags);

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

You're welcome. Smile | :)

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Hi everyone. Well, I was looking for something to do tonight, and thought why not see what to do with exchange. By this I mean, we use Exchange 2000 at work, and it works. But it is very slow, and has loads of extra functions that a lot of people would not use. So I wanted to see if I could make my own.

Anyway, the problem is this. Where do you get started trying to make an app that uses Exchange? I could not find much on MSDN, it seems to all be about Exchange 2003. If you have any ideas, or know a good tutorial, please let me know.

Try these links:

http://www.codeproject.com/useritems/exdav.asp[^]

http://www.codeproject.com/useritems/mailcheck.asp[^]

Ok. I've been learning C# and I'm starting an aplication that uses a Listview in Detail view. I want to make the columns re-orderable and be able to save the order for the next time the form is loaded. But I dont know how to get the column order. The indexes dont change, so the columns are not rearanged in the collection.
Can anyone help? Thanks!

Scott Kelly

The following CodeProject article has a solution for your problem:

http://www.codeproject.com/useritems/SaveListView.asp[^]

See also:

http://www.codeproject.com/cs/miscctrl/ListViewFilter.asp[^]

I've created a number of overdrawn controls (status bar, group box) and they drawn fine, and as i want. However if you move another window over the window with these controls, you get odd kinda painting on the controls, kinda like window borders left over, etc. I would guess by getting all the controls to redraw themeselves would work, but I can't seem to get this sorted. i tried overidding the OnGotFocus in the main form on which these controls reside to call Invalidate(true), but it doesn't seem to work.

Any ideas??

[Edit]
I've managed to solve this by calling the Invalidate in the Frosm Activate event. However I still the same problem when say a drop down box (an owner drawn one) drops the list over the owner drawn controls. is there anyway of solving this short of calling invalidate alot, which. All the owner drawing is done by overriding the OnPaint in the pretty standard way.
[/Edit]

You need to do this in the constructor:

this.SetStyle(ControlStyles.AllPaintingInWmPaint |
    ControlStyles.UserPaint | 
    ControlStyles.DoubleBuffer,true);

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

There all ready set in the constructor. Thats why it's puzzling me a little.

You don't know how many times I've gone through owner draw problems like this. That's why I'm glad we're now re-implementing all Windows controls from scratch[^], with full owner draw/skinning capabilities. I've been named design leader for the project.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Sounds like a good idea. I'll be sure to follow the project. Will you guys be posting your progress? if you want testers in the future let me know.