how to perform validation on textbox in templatecolumn of datagrid?

[mendhak]

OK, a few changes to what I said.

Instead of

validator.ControlToValidate = txtbox.ClientID

put

validator.ControlToValidate = txtbox

That should do it.

Btw, you never said what the error was, but try what I just said right now.

[nemaroller]

That won't work - the ControlToValidate property expects a string, not a control class object.

You never stated what the error was, but you need the UniqueID property.

validator.ControlToValidate = txtbox.UniqueID.

[asp.net_vb.net]

The error is

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 613:        txtbox = CType(e.Item.FindControl("textbox"), System.Web.UI.WebControls.TextBox)
Line 614:       
Line 615:        validator.ControlToValidate = txtbox.UniqueID

[mendhak]

That won't work - the ControlToValidate property expects a string, not a control class object.

You never stated what the error was, but you need the UniqueID property.

validator.ControlToValidate = txtbox.UniqueID.

My bad, but not-so-bad, I had no IDE and Intellisense