Problem with Gridview

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ASP.NET

i have grid with 3 column, one is filled with Sno, and other two has Textboxes in it for the user to enter the text.
I have used this code to change the active row color. But the problem i am facing is i cant type in the textboxes.

Please advice any other suitable way. or do i need to change anything in the code.

protected override void Render(System.Web.UI.HtmlTextWriter writer)
   {
       foreach (GridViewRow row in GridviewSample.Rows)
       {
           if (row.RowType == DataControlRowType.DataRow)
           {
               row.Attributes["onmouseover"] =
                  "this.style.cursor='hand';this.style.textDecoration='underline';";
               row.Attributes["onmouseout"] =
                  "this.style.textDecoration='none';";
               // Set the last parameter to True
               // to register for event validation.
               row.Attributes["onclick"] =
               ClientScript.GetPostBackClientHyperlink(GridviewSample,
                  "Select$" + row.DataItemIndex, true);
           }
       }
       base.Render(writer);
   }

and this is my gridview.

<asp:GridView ID="GridviewSample" runat="server" AutoGenerateColumns="false"
        onselectedindexchanged="GridviewSample_SelectedIndexChanged"
        onselectedindexchanging="GridviewSample_SelectedIndexChanging"
        SelectedRowStyle-BackColor="LightGray" ondatabound="GridviewSample_DataBound"  >
    <Columns>
     <asp:BoundField DataField="SNo" HeaderText="SNo" />
    <asp:TemplateField HeaderText="Name">
    <ItemTemplate >
     <asp:TextBox ID="txtname" runat="server" ></asp:TextBox>
    </ItemTemplate>
    </asp:TemplateField>
     <asp:TemplateField HeaderText="Age">
    <ItemTemplate >
     <asp:TextBox ID="txtage" runat="server" ></asp:TextBox>
    </ItemTemplate>
    </asp:TemplateField>
    </Columns>
    </asp:GridView>