how to perfom calculation in dynamic table

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C#3.0

C#

In the button click event, I want to get the cell value in dynamic table
and then calculate the value and insert it into the database.

Code below.

protected void btnCalc_Click(object sender, EventArgs e)
        {
            Table tblnew = new Table();
            //foreach (Control c in this.form1.Controls)
            //{
                            if (Request.Form["txt" + a] != null)
                            {
                                 txta =Convert.ToInt32(Request.Form["txt" + a]);
                                a = a + 1;
                                //break;
                            }
                            if (Request.Form["txtExR1"] != null)
                            {
                                 txtex = Convert.ToInt32(Request.Form["txtExR1"]);
                                 //Request.Form["col24"].Replace("",inr);
                            }
                            if (Request.Form["lbl24"] != null)
                            {
                             string ss=   Request.Form["lbl24"].Insert(0, "econ");
                            }
                            if (Request.Form["col24"] != null)
                            {
                                Request.Form["col24"].Insert(0, "econ");
                            }
                                 //l.Text = inr;
                            string usd = (txta * Convert.ToInt32(lblq1.Text)).ToString();
                            string cal = (txta * txtex).ToString();

                            lctxt.Value = cal;
                            //dpnl.Visible = true;


            //}
            dpnl.Visible = true;
            cnt = 0;
           // chk();
            Invoice_Report();
            Panel1.Visible = false;
            btnchrg.Visible = true;
            btnCalc.Visible = true;