CType Problems

[ColinM]

Hi,
I'm fairly new to ASP.NET to hopefully an easy one to solve
Whats wrong with this?

Dim Resolved as Boolean = CType(e.Item.Cells(4).Controls(0), Checkbox).Checked

I'm trying to store the value from a datagrid for an update in a datagrid. It works for text but not for a checkbox

System.InvalidCastException: Specified cast is not valid.

 

[jfrost10]

I've done this but with a few extra steps:

Dim chkCheck as new Checkbox
Dim Resolved as Boolean

chkCheck = CType(e.Item.Cells(4).Controls(0), Checkbox)
Resolved = chkCheck.Checked

Also, the cell is usually considered the first control, so to get the checkbox you should try using
e.Item.Cells(4).Controls(1)

hth

D'Arcy

 

[ColinM]

Yeah, that'll do nicely, thanks
I've got this now

Dim EnteredOn as DateTime = CType(CType(e.Item.Cells(3).Controls(0), TextBox).Text , datetime)
Dim Resolved as Boolean = Ctype( CType(e.Item.Cells(4).Controls(1), Checkbox).Checked , boolean)

and it works (just about)

Although I don't really understand why their should be a difference between the controls(num) for a textbox as opposed to a checkbox.
Changing controls(0) to controls(1) for the textbox results in an out of range exception.

 

[jfrost10]

Are you sure that its the textbox that its grabbing?

if you have any text in the cell, it might be grabbing the cell and casting it into a textbox.

Just a thought anyway


D'Arcy

 

[ColinM]

AAah, I think I see what you mean.

Better do some more reading.

 

[JohnYingling]

Small point. You do not need New on the Dim statement
Dim chkCheck as new Checkbox
because chkCheck is not used until after
chkCheck = CType(e.Item.Cells(4).Controls(0), Checkbox)
which sets the variable to an existing instance of a checkbox.

http://www.VBResizer.com

Forms/Controls Resizing/Tabbing Control

http://www.VBCompare.com

Compare Code (Text)

http://www.VBSortGen.com

Generate Sort Class in VB or VBScript

 

[jfrost10]

And a pick, and a pick and a pick pick pick



D