acess value of dynamic textboxes from dynamic gridview

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C#

Dear friends,

I want to enter and insert all rows in one go from Gridview textboxes into database , initially all textboxes are empty. I have 40 rows and 16 columns of text box in Gridview and 1 column for display purpose in unicode (extreme left) .

For simplicity of code I have written only 2 column here, one for display purpose as first column and second column as text box for inserting data from user.

I have difficulty in accessing value from dynamic bound Gridview Textbox under ItemTemplate.

Please help me out in fetching values from Gridview textbox after button click.
HTML:

<asp:GridView ID="gv1" runat="server" Visible="true" ShowHeader="true" AutoGenerateColumns="false" >
    <columns>
        <asp:BoundField DataField="Column1" HeaderText="1" />
        <asp:TemplateField HeaderText="2">
            <itemtemplate>
<asp:TextBox ID="txtcol2" Text='<%# Eval("Column2") %>' EnableViewState="true" runat="server" MaxLength="7" Width="75px"
                 >
            </itemtemplate>
        
 </columns>

Code Behind for Gridview Data binding:

private void BindGrid()
{
    DataTable dt = new DataTable();
    DataRow dr = null;
    dt.Columns.Add(new DataColumn("Column1", typeof(string)));
    dt.Columns.Add(new DataColumn("Column2", typeof(string)));
    dr = dt.NewRow();
    dr["Column1"] = "कर /पथकर शुल्कों से आय"; //In Hindi
    dr["Column2"] = string.Empty;
    dt.Rows.Add(dr);
    gv1.DataSource = dt;
    gv1.DataBind();
}

Code Behind for fetching value from Gridview after button click to insert all rows into database:

protected void Button1_Click(object sender, EventArgs e)
{
    foreach (GridViewRow row in gv1.Rows)
    {
        TextBox textBoxq = row.FindControl("txtcol2") as TextBox;
        // OR  below code is also not working
        //for this i do Gridview and textboxes enableviewstate false but it also not working.
        
        //value of boundfield is access but value of textboxes is not access...but in textshow null      
    }
}

Please give me a solution??????????????????


[Edit member="Tadit"]
Corrected formatting and/or grammatical issues.
Added pre tags.
[/Edit]