AJAX :: Allow User To Enter Only Digits And Numbers Using FilteredTextBoxExtender In GridView EditItemTemplate

Jan 27, 2013

How can I validate a Boundfield in gridview that changes to textbox dynamically?the boundfield is
 
<asp:BoundField DataField="quantity" HeaderText="quantity" />
and it chenges to textbox in code belowI want only number (1,2,3,...) in it not text.
protected void CartGrid_RowUpdating(object sender, GridViewUpdateEventArgs e)
{

[Code]....

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