Asp.net Code
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False"
CssClass="mGrid"
DataKeyNames=""
ShowFooter="true"
Width="400px"
onrowdeleting="gvDetails_RowDeleting"
onrowupdating="gvDetails_RowUpdating">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgbtnDelete" runat="server" CommandName="Cancel" ImageUrl="~/MineBlast/Image/delete.jpg" ToolTip="Cancel" Height="20px" Width="20px" />
</ItemTemplate>
<ItemTemplate>
<asp:ImageButton ID="imgbtnUpdate" CommandName="Update" runat="server" ImageUrl="~/MineBlast/Image/update.jpg" ToolTip="Update" Height="20px" Width="20px" />
</ItemTemplate>
</asp:TemplateField>
<%-- <asp:BoundField DataField="HAU_ID" HeaderText="HAU ID" />--%>
<asp:TemplateField HeaderText="HAUID">
<ItemTemplate>
<asp:TextBox ID="TXtHauID" runat ="server" Text='<%#Eval("HAU_ID") %>' ></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Diesel">
<ItemTemplate>
<asp:TextBox ID="TextID1" runat ="server" Text='<%#Eval("HAU_DIESELISSUED") %>' ></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText ="REGNO">
<ItemTemplate >
<asp:TextBox ID="TextID2" runat ="server" Text ='<%#Eval("HAU_REGISID") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="TONNAGE">
<ItemTemplate>
<asp:TextBox ID="TextID3" runat ="server" Text ='<%#Eval("HAU_TONNAGE") %>' ></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="TYPE" >
<ItemTemplate>
<asp:TextBox ID="TextID4" runat ="server" Text ='<%#Eval("WORD") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="TRIPS" >
<ItemTemplate>
<asp:TextBox ID="TextID5" runat ="server" Text ='<%#Eval("HAU_TRIPS") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="CREATE DATE" >
<ItemTemplate>
<asp:TextBox ID="TextID6" runat ="server" Text ='<%#Eval("CREATED_DATE") %>' ></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle HorizontalAlign="Center" />
<RowStyle HorizontalAlign="Center" />
</asp:GridView>
In aspx.cs
protected void gvDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string myfile = GridView1.Rows[e.RowIndex].Cells[1].FindControl("HAU_ID").ToString () ;
TextBox TextID1 = (TextBox)GridView1.Rows[e.RowIndex].FindControl("TextID1");
TextBox TextID2 = (TextBox)GridView1.Rows[e.RowIndex].FindControl("TextID2");
TextBox TextID3 = (TextBox)GridView1.Rows[e.RowIndex].FindControl("TextID3");
TextBox TextID4 = (TextBox)GridView1.Rows[e.RowIndex].FindControl("TextID4");
TextBox TextID5 = (TextBox)GridView1.Rows[e.RowIndex].FindControl("TextID5");
TextBox TextID6 = (TextBox)GridView1.Rows[e.RowIndex].FindControl("TextID6");
}