You can only enter numbers in the text box of the control template column and disable pasting.

Method 1:
JavaScript Functions that control input numbers in HTML
Function limitnumber (OBJ)
{
OBJ. maxlength = 20;
If (! (Window. event. keycode> = 48) & (window. event. keycode <= 57 ))
| (Window. event. keycode = 46) | (window. event. keycode = 45 )))
{
Window. event. keycode = 0;
}
}

In the template Column
<Asp: textboxOnkeypress = "limitnumber ('txtsqf')" onpaste = "Return false"Id = txtsqf
Runat = "server" width = "50px" text = '<% # databinder. eval (container, "dataitem. sqf") %>'>
Method 2:
Because method 1 cannot avoid Chinese Input problems, it still needs to be improved. Method 2: the server-side controls are implemented in a simple way. Add the regularexpressionvalidator control to the text box in the template column. The regular expression is ^ (-? \ D +) (\. \ D + )? $.