How to Update the Data in Gridview using C#

  
    protected void gdv_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        TextBox tb1 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[1].Controls[0];
        TextBox tb2 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[2].Controls[0];
        TextBox tb3 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[3].Controls[0];
        TextBox tb4 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[4].Controls[0];
        TextBox tb5 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[5].Controls[0];
        TextBox tb6 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[6].Controls[0];
        TextBox tb7 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[7].Controls[0];
        TextBox tb8 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[8].Controls[0];
        TextBox tb9 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[9].Controls[0];
        TextBox tb10 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[10].Controls[0];
        TextBox tb11 = (TextBox)gdMidmasterSearch.Rows[e.RowIndex].Cells[11].Controls[0];

       DB_MIDMaster objMidUpdate = new DB_MIDMaster();

        objMidUpdate.strMid = Convert.ToString (tb1.Text);
        objMidUpdate.strTid = Convert.ToString(tb2.Text);
        objMidUpdate.strSuperMid = Convert.ToString(tb3.Text);
        objMidUpdate.strSuperTid = Convert.ToString(tb4.Text);
        objMidUpdate.strPaymentOption = tb5.Text;
        objMidUpdate.strEmiMonth  = tb6.Text;
        objMidUpdate.strtypes = tb7.Text;
        objMidUpdate.strPaymentModes  = tb8.Text;
        objMidUpdate.strLocation = tb9.Text;
        objMidUpdate.strMSFCharges = tb10.Text;
        objMidUpdate.strServiceTax   = tb11.Text;
        objMidUpdate.MidMaster_Update();
        gdMidmasterSearch.EditIndex = -1;
        lblMessage.Visible = true;
        lblMessage.InnerHtml = "Details are Updated Successfully.";
        BindToGrid();
    }