I have a gridview in which I have 100 rows of Textboxes. All textboxes have same id 'TxtEmpcode'. User enters data in some rows of gridview. How do I validate textboxes such that one Employee code is entered only once in textboxes. This is to avoid duplicate
entry of data. Suppose a user enters Employee code '1234', this should not allowed in other rows of textboxes. If they enter, a message should appear as 'Employee Code has already been entered'.
Can anyone tell how to achieve this?
<asp:GridView ID="GridView2" runat="server" style="margin-left: 23px; margin-top: 11px;" Width="420px" CellPadding="4" AutoGenerateColumns="False" ForeColor="#333333" GridLines="None" Height="213px" >
<AlternatingRowStyle BackColor="White" />
<Columns>
...
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