C# - cannot read dynamically created textbox in gridview

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C#

Hi I 'm programatically creating text boxes in gridview. But I'm unable to get the value from the text box.

I have a text box where i get the number of rows to be created and on pressing "Go" button, it populates gridview with dynamically created text boxes.

I need to read the values from gridview text boxes and this is where i got stuck.

My Gridview:

<asp:GridView ID="gvPlan" runat="server" ShowFooter="True" AutoGenerateColumns="true">
<Columns>
</Columns>
</asp:GridView>

Code Page:

protected void btnGo_Click(object sender, EventArgs e)
{
   Insert_Grid();
}

private void Insert_Grid()
{
   CreateGridView();
   int numbers = int.Parse(txtRows.Text.Trim());
   int cellCount = gvPlan.Rows[0].Cells.Count;
   int rowsCount = gvPlan.Rows.Count;
   foreach (GridViewRow row in gvPlan.Rows)
   {
      // text box - ID
    TextBox txtID = new TextBox();
    txtID.ID = "tID" + (Convert.ToInt32(row.RowIndex + 1)).ToString();
    txtID.Attributes.Add("runat", "server");
    row.Cells[1].Controls.Add(txtID);

      // text box - NAME
    TextBox txtName = new TextBox();
    txtName.ID = "tName" + (Convert.ToInt32(row.RowIndex + 1)).ToString();
    txtName.Attributes.Add("runat", "server");
    txtName.Attributes.Add("ReadOnly", "true");
    row.Cells[2].Controls.Add(txtName);
   }
}

private void CreateGridView()
{
   int numbers = int.Parse(this.txtRows.Text.Trim());
   DataTable dt = new DataTable();
   dt.Columns.Add("ID", typeof(string));
   dt.Columns.Add("Name", typeof(string));
   
   for (int i = 0; i < numbers; i++)
   {
      dt.Rows.Add("", "");
   }
   ViewState["CurrentTable"] = dt;
   gvPlan.DataSource = dt;
   gvPlan.DataBind();
}

protected void btnSave_Click(object sender, EventArgs e)
{
   int rowIndex = 0;
   if (ViewState["CurrentTable"] != null)
   {
      DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
      if (dtCurrentTable.Rows.Count > 0)
      {
        for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
        {
          //extract the TextBox values
          TextBox gtxtID = (TextBox)gvPlan.Rows[rowIndex].Cells[1].FindControl("tID" + (rowIndex+1));
          TextBox gtxtName = (TextBox)gvPlan.Rows[rowIndex].Cells[2].FindControl("tName" + (rowIndex + 1));
           gtxtName.Text = gtxtID.Text;
          rowIndex++;
        }
    }
}

The issue is in "btnSave_Click" procedure where i dont seem to get the value from gtxtID. It cannot find the text box control and the object is null

Your help is much appreciated.

Regards
Ilyas

What I have tried:

Tried debugging code by code but in vain