I want to change the width of column in Gridview bound field but it is not changing .
<asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address">
<ItemStyle Width="500px" />
Have you tried?
<asp:GridView ID="dad" runat="server">
<asp:BoundField ItemStyle-Width="500px" />
What croker10 posted, works for me.
If you're still having problems with that, try adding the columns/rows data dinamically on server side
Try this link http://stackoverflow.com/questions/8266580/asp-net-setting-width-of-databound-column-in-gridview