Can't Fetch the value from textbox in gridview which is nested in datalist control

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C#

ASP.NET

WebForms

Gridview

I have a problem when working on gridview which is binded in a datalist.
I am building a input form in a matrix from which is depend on two tables.
on table for rows and other table for columns.
like this:
------------------------------------------------------------------
------------ |-- Col1--| ---Col2--- | ---Col3--- | --Col4---
--------------------------------------------------------------------
Rowname1 | Textbox | Textbox | Textbox | Textbox
------------------------------------------------------------------
Rowname2 | Textbox | Textbox | Textbox | Textbox
------------------------------------------------------------------
Rowname3 | Textbox | Textbox | Textbox | Textbox
------------------------------------------------------------------
Rowname4 | Textbox | Textbox | Textbox | Textbox
------------------------------------------------------------------
Rowname5 | Textbox | Textbox | Textbox | Textbox
------------------------------------------------------------------


this is my code for building this layout

<asp:DataList ID="DataList1" runat="server" OnItemDataBound="DataList1_ItemDataBound"
           Width="490px" RepeatDirection="Horizontal" BorderWidth="1px">
           <ItemTemplate>
               <table>
                   <tr>
                       <td>
                           <table border="1px">
                               <tr>
                                   <td style="text-align: center">
                                       <asp:Label ID="Label1" CssClass="floa" runat="server" Text='<%#Eval("Branch_name") %>'></asp:Label>
                                                                          </td>
                               </tr>
                               <tr>
                                   <td>
                                       <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" ShowHeader="false"
                                           BorderStyle="None">
                                           <Columns>
                                               <asp:TemplateField HeaderText="">
                                                   <ItemTemplate>
                                                       <asp:Label ID="Label3" runat="server" Text='<%#Eval("Affiliate") %>' Width="150px"></asp:Label>
                                                   </ItemTemplate>
                                               </asp:TemplateField>
                                               <asp:TemplateField HeaderText="">
                                                   <ItemTemplate>
                                                       <asp:CheckBox ID="CheckBox1" runat="server" />
                                                   </ItemTemplate>
                                               </asp:TemplateField>
                                               <asp:TemplateField HeaderText="Value(%)">
                                                   <ItemTemplate>
                                                       <asp:TextBox ID="TextBox3" runat="server" CssClass="text"></asp:TextBox>
                                                   </ItemTemplate>
                                               </asp:TemplateField>
                                           </Columns>
                                       </asp:GridView>
                                   </td>
                               </tr>
                           </table>
                       </td>
                   </tr>
               </table>
           </ItemTemplate>
       </asp:DataList>

I am using Gidview for input which is binded in datalist horizontly

This is my code for binding this gridview inside datalist:--

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            GridView gv = (GridView)e.Item.FindControl("GridView1");

            if (gv != null)
            {
                gv.DataSource = s.Tables[1];
                gv.DataBind();
                if (i != 1)
                {
                    gv.Columns[0].Visible = false;
                }
                i++;
         }

The binding of this gridview inside this control is working properly; but
when i want to fetch data from the textbox of gridview control i can't get it.
means I successfuly find the control on submit button's click. But i can't able to find the edited changed data from the textbox from gridview control.

this is my coding for submit button's click

protected void Button1_Click(object sender, EventArgs e)
    {
        GridView gv = (GridView)DataList1.Items[0].Controls[1].FindControl("GridView1");
        int i = gv.Rows.Count;
        string t = ((TextBox)gv.Rows[1].FindControl("DataList1_ctl00_GridView1_ctl03_TextBox3")).Text;
        Response.Write(t);

}


Please, tel me if i am wrong anywhere, and how can i fetch data from Gridview's Textbox