How to add dropdown list default value

you have to use below menioned code after Databind

ddl_state.Items.Insert(0, new ListItem("--Please Select state--", "0"));

After data-binding, do this:

ddl_state.Items.Insert(0, new ListItem("Select","NA")

Or add it in markup as:

<asp:DropDownList .. AppendDataBoundItems="true">
   <Items>
       <asp:ListItem Text="Select" Value="" />
   </Items>
</asp:DropDownList>

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