Here is the code:
HTML MAKUP:
<asp:GridView ID="GridViewORDER" runat="server" AutoGenerateColumns="False" class="table table-striped table-bordered table-hover" DataKeyNames="Invoice_No" OnRowEditing="GridViewORDER_RowEditing" OnRowCancelingEdit="GridViewORDER_RowCancelingEdit1" OnRowUpdating="GridViewORDER_RowUpdating">
<AlternatingRowStyle CssClass="warning" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="btnEdit" runat="server" BorderColor="#CCFF33" BorderStyle="Ridge" BorderWidth="2px" CommandName="Edit" CssClass="btn ...
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