how to create editable combobox inside a templatecolumn of datagrid

See the below links:-

http://stackoverflow.com/questions/10302173/single-click-edit-on-wpf-datagrid-combobox-template-column
http://stackoverflow.com/questions/18598599/edit-datagrid-combobox-or-textbox
http://social.msdn.microsoft.com/Forums/silverlight/en-US/7d15482c-8919-4549-8a1b-6fa1940288a4/programmatically-create-combo-box-template-column-in-datagrid
http://go4answers.webhost4life.com/Example/accessing-combobox-inside-wpf-datagrid-89650.aspx
http://blogs.msdn.com/b/vinsibal/archive/2008/08/19/wpf-datagrid-stock-and-template-columns.aspx

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You can take dropdownlist inside Itemtemplate or EditItemTemplate as shown:-

<asp:GridView ID="grid_view_employee_details" runat="server" AllowPaging="true" AutoGenerateColumns="false"
OnRowDataBound="grid_view_employee_details_RowDataBound" OnSelectedIndexChanged ="grid_view_employee_details_SelectedIndexChanged">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:DropDownList ID="ddl_employee_name" runat="server"></asp:DropDownList>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddl_edit_employee_name" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

You can fill employee dropdownlist in Gridview RowdataBound event and button click,you can find your control.

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Also see:-
http://stackoverflow.com/questions/7764446/issue-with-populating-dropdownlist-in-gridview-edit-mode-in-c-sharp
http://stackoverflow.com/questions/833490/gridview-row-editing-dynamic-binding-to-a-dropdownlist
http://stackoverflow.com/questions/18656733/how-to-bind-asp-net-dropdownlist-control-in-edititemtemplate-of-gridview-on-edit
http://forums.asp.net/p/1604495/4089355.aspx
http://www.codeproject.com/Articles/23471/Editable-GridView-in-ASP-NET-2-0

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