example:
<input id="txtEntQty" type="number" min="1" max='<%# Eval("RemQty")%>' value='<%# Eval("RemQty")%>'>
code behind:
int ASSIGNQTY = Convert.ToInt32((row.Cells[12].FindControl("txtQty") as **?????**).value);
example:
<input id="txtEntQty" type="number" min="1" max='<%# Eval("RemQty")%>' value='<%# Eval("RemQty")%>'>
code behind:
int ASSIGNQTY = Convert.ToInt32((row.Cells[12].FindControl("txtQty") as **?????**).value);
Try this make your input
runat="server"
And in .cs code where you want to get value write thiss