Create Grids in Runtime + Asp.net + Cannot get value

Dear EE Members

We are using VS 2008

We have create a grid X, on runtime inside a repeater control, dynamically (on repeaters item databound control), as we donot know the number of columns and rows in X and it is dependent on the data in the database.  

The issue is all works fine, but we have not been able to capture the value of any control bound to the grid on runtime
label, text or otherwise.

How we tried

                   

Object reference error comes when we run it as per above.

Pleae advise

dtStructured = new StructuredBL().InsertStructureRows(dtStructured);
                    GridView gv = (GridView) pnlStructured.FindControl("gv");
                    gv.RowDataBound += new GridViewRowEventHandler(gv_RowDataBound);

                    foreach (DataColumn dc in dtStructured.Columns)
                    {
                        TemplateField tf = new TemplateField();
                        string ctlType = "";
                        if (dc.DataType.Name == "String") { ctlType = "Label"; }
                        else { ctlType = "TextBox"; }
                        tf.HeaderText = dc.ColumnName;
                        tf.FooterStyle.CssClass = dc.Caption;
                        gv.Columns.Add(tf);
                    }
                    gv.DataSource = dtStructured;
                    gv.DataBind();




        void gv_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                for(int i=0; i<e.Row.Cells.Count; i++)
                {
                    HtmlInputText hit = new HtmlInputText();
                    hit.ID = "CTL" + i.ToString();
                    e.Row.Cells[i].Controls.Add(hit);
                }
            }
            //throw new NotImplementedException();
        }





        protected void cmdSaveDraft_Click1(object sender, EventArgs e)
        {
            foreach (RepeaterItem ri in rptFillDataForm.Items)
            {
                    GridView gv = (GridView)ri.FindControl("gv");
                    MyCollection<StructuredValue> myStrValues = new MyCollection<StructuredValue>();
                    StructuredValue strVal;
                    for (int j=0; j<gv.Columns.Count; j++)
                    {
                        for(int row=0; row<gv.Rows.Count; row++)
                        {
                            strVal = new StructuredValue();
                            Control ctl = gv.Rows[row].FindControl("txt"+ gv.Columns[j].HeaderText);
                            if(ctl.GetType().Name != "TextBox") { break; }
                            strVal.ColID = Convert.ToInt32(gv.Columns[j].FooterStyle.CssClass);
                            strVal.RowID = row + 1;
                            strVal.DataFormID = objDataFormIndicator.DataForm.ID;
                            strVal.IndicatorID = objDataFormIndicator.Indicator.ID;
                            strVal.Value = Convert.ToDouble(((TextBox)ctl).Text);	// THIS IS WHERE I AM TRYING TO CAPTURE VALUE FROM TEXTBOX
                            myStrValues.AddItems(strVal);
                        }
                    }
                    int iResult = new StructuredBL().InsertStructuredValues(myStrValues, ((User)Session["CurrentUser"]).ID);

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