Visual Basic

Re: Please explain code [modified]

28-Jul-07 12:37

Thank you. You took the ~~words out of my mouth~~, errr, off my keyboard Roll eyes | :rolleyes:

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

ASPnoob28-Jul-07 12:47

ASPnoob

28-Jul-07 12:47

Suppose I have a file called MyDocumument that is stored as a blob in a database. So if I want to put it in an array of bytes so it can be displayed, I probably can not simply pass the name of the file in like this Encoding.UTF8.GetBytes("MyDocument"). How would I then put this in an array of byte, and do I even need to encode the file inorder to display it? Please explain, thanks for your time.

-- modified at 18:55 Saturday 28th July, 2007

Re: Please explain code

Guffa28-Jul-07 13:11

Guffa

28-Jul-07 13:11

How are you displaying the information? Unless you are writing the output as a binary stream, you don't have to encode the data. Most ways of output takes strings, and does the encoding automatically according to a previously selected encoding.

---
single minded; short sighted; long gone;

showModalDialog

Rahithi28-Jul-07 11:08

28-Jul-07 11:08

Hi all,

i am using showModalDialog to open the popup window. I am sending one object from parent window to child window and doing some processing in child window. Now I have to set the values in the parent window based on the calculations in the child window.

I came to know that from the child window, we can set the values for the controls which are in parent.

I appreciate if some one can let me know how to do this…..

Thanks in advance,

Rahi

If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Paul Conrad28-Jul-07 12:03

Re: showModalDialog [modified]

28-Jul-07 12:03

This article, http://www.codeproject.com/dotnet/passingvaluesbetweenforms.asp[^] may be of help for you...

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Rahithi28-Jul-07 17:30

28-Jul-07 17:30

Thanks Paul for responding to my query.

I saw this article. Nice one. Unfortunately, I didn't find the solution for my problem. In this Article, Colin focused on passing the data from Parent to child but not child to parent.

I am sending some data from the parent form to child in the form of object, when the user closes the popup window; I want to populate the controls which are placed on parent form, with the data which is processed in child form.

Thanks,
Rahi

-- modified at 23:45 Saturday 28th July, 2007

If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Paul Conrad28-Jul-07 17:39

28-Jul-07 17:39

I thought you were going from child to parent, my misunderstanding Blush | :O

Good way to pass data from parent to child could be to modify the constructor for the child form to have a parameter that is the data you want to pass. For example, if I wanted to pass a string from MyTextBox.text from the parent to child, I could do something like:

<font>     ...
     Dim MyChildForm As New ChildForm( MyTextBox.text )
     MyChildForm.Show ' or ShowDialog

</font>

In the code for ChildForm, you would have the constructor look like:

<font>     Dim Private MyParentString As String

     Public Sub New(ByVal MyTextString As String)
          MyParentString = MyTextString
     End Sub

</font>

Change the form names to the ones you are using, and the data and datatype of what you are passing.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Rahithi28-Jul-07 17:49

28-Jul-07 17:49

Sorry Paul,

i sent the wrong message...just now i modified my message.

i am able to pass the data(in the form of object) from parent to child. my problem is i have to pass the data from child to parent.

when user clicks on Close Button on child(pop-up window), i have to populate the controls which are on Parent form.

Thanks once again for your response...

Rahithi

If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Paul Conrad28-Jul-07 18:10

28-Jul-07 18:10

The child form, you could overload the Close method with something like:

Overloads Function Close() As {  Your-DataType-Of-Data-To-Pass-Back  }
     Return {  The-Data-You-Want-Parent-To-Get-From-Child  }
End Function

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Rahithi28-Jul-07 18:20

28-Jul-07 18:20

Ok!! i will try this .

but one more simple doubt.........is it possible to directly populate the data in the parent controls using this overloaded close function??

Many Thanks,
Rahi

If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Paul Conrad28-Jul-07 18:30

28-Jul-07 18:30

Are you loading a dataset or something like that (datatable adapter, datarows, etc) in the child form? If so, pass the dataset back as a return value from the overloaded Close function.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Rahithi28-Jul-07 18:53

28-Jul-07 18:53

paul,

thanks alot for your answer!!!!!

i am sending Collection (object) to child window. almost 20 records(30 columns per record) of data but now i need only 4 values (need to populate 4 text box controls)from child window.

i heard that if we use Show model dialogue to open the pop-up window, we can directly access the Parent winodow controls in the pop-up window, so that we can set the values directly from child window it self..i mean no need to pass the data using sessions..or anything...
please discard my statement if it is wrong.......i am new to .Net technology.......this is my first project.

when user hits on Close button on child window, parent window gets focused....at the same time we have to show these values on parent.

any idea???????????

Thanks,
Rahi

If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

VB.Net 2003 DataGrid Cell Selection

Jeff Bowman28-Jul-07 21:25

Jeff Bowman

28-Jul-07 21:25

Hi Rahithi

Add this property to your child form:

Private Readonly Property OwnerForm As ParentForm
  Get
    Return Me.OwnerForm
  End Get
End Property

Now you can access any property you expose on your parent form from your child form's Close event.

HTH

ford8628-Jul-07 10:57

ford86

28-Jul-07 10:57

Hi everyone,

I've been trying to select (from the code) a specific cell in the DataGrid control to change it's value.

Exemple: if [cell].text = "" then [cell].text = "0"

I didn't actually find a way to do that. Can someone help me out?

Thanks!

Re: VB.Net 2003 DataGrid Cell Selection

Rahithi28-Jul-07 17:42

28-Jul-07 17:42

Hi,

look at this code, i am checking the cell value when i am binding the data ....and if it is empty, then i am displaying it as '0'

hope this will give you some idea resolve your problem!!

Private Sub YourDataGridName_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles YourDataGridName.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then
If e.Item.Cells(0).text="" then e.Item.Cells(0).text=0
End if
end sub

Thanks,
Rahi

If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Combobox Problems

ryan11728-Jul-07 10:53

ryan117

28-Jul-07 10:53

1. Could anyone tell me what code to use to check whetever the combobox selection is empty, Please? I tried the following code and didn't select any item, and both of them were error while compiling.

IsNullOrEmpty(combobox1.SelectedItem.ToString()<br />
combobox2.SelectedItem.ToString <> ""

2. Also, how do I "reset" a combobox? I mean, resetting the combobox that no item is selected? I tried this code, but it didn't work.

combobox1.selectedItem = ""<br />
combobox1.selectedText = ""

Could someone here give me a help, please?

Thank You Very Much. Ryan

Re: Combobox Problems

Luc Pattyn28-Jul-07 11:51

Luc Pattyn

28-Jul-07 11:51

Hi,

(I'm a C# guy, so when I say null you read Nothing)

A combobox holds a collection of items; their type can be anything (they are
Objects); often they are strings.

For selection you have properties:
SelectedItem: is an object, should be in the collection, or null
SelectedIndex: is an int, the index in the collection (zero based), or -1 for none
SelectedText: the result of SelectedItem.ToString(), or null/"" (not sure)

Test:
bool somethingGotSelected=cb.SelectedItem!=null;

Clear:
cb.SelectedItem=null;

Check the documentation, read about combobox, use MSDN;
and try to understand what you are doing !

you cant do cb.SelectedItem.ToString since SelectedItem could be null.
you cant do cb.SelectedItem="" unless "" is in the list

good luck.

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Re: Combobox Problems

The ANZAC28-Jul-07 12:31

The ANZAC

28-Jul-07 12:31

i think with .net indexing, when no object is selected the selected index is set to -1. With a listbox you go:

if me.listbox1.selectedindex = -1 then<br />
' you know nothing is selected<br />
end if

It should be the same for the combobox. Same with the ressetting, probably set the selected index to -1.

Please check out my articles:
The ANZAC's articles

Validation

ryan11728-Jul-07 10:33

ryan117

28-Jul-07 10:33

Could anyone tell me what code I shall use to validate input string in all char and numeric, like using ASCII, please? Providing code examples is very appreciated.

Thank You Very Much. Ryan

Paul Conrad28-Jul-07 10:50

28-Jul-07 10:50

You could validate through regular expressions...

alurora wrote:
Providing code examples is very appreciated.

Google around, there are plenty of examples. Search on this site for Expresso, which is regular expression tool that is incredibly handy to have around Smile | :)

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Luc Pattyn28-Jul-07 11:55

Luc Pattyn

28-Jul-07 11:55

I will not give examples, there is lots of documentation (MSDN(, and articles
everywhere (including CodeProject).

The keywords you could look for are:
MaskedTextBox
int.TryParse
double.TryParse

and for the most challenging validations: Regex class (which is difficult !)

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Paul Conrad28-Jul-07 12:37

28-Jul-07 12:37

Luc Pattyn wrote:
which is difficult !

Yes, but powerful if I may add Smile | :)

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Luc Pattyn28-Jul-07 13:49

Luc Pattyn

28-Jul-07 13:49

Sure, there would be little value in "difficult but not powerful".

Didnt seem to me like a good idea to stear the OP in that direction tho.
If unfamiliar with TryParse, what a question avalanche should we expect
from Regex attempts ?

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Paul Conrad28-Jul-07 13:59