Data are not updating also not giving any error

void submit(Object s, EventArgs e)
{
    con.Open();
    if ((File1.PostedFile != null) && (File1.PostedFile.ContentLength > 0))
    {
        fn = System.IO.Path.GetFileName(File1.PostedFile.FileName);
        fn = txtName.Text.Trim() + fn;
        SaveLocation = Server.MapPath("~/Upload/" + fn);
        txtPhoto.Text = SaveLocation;
    }
    else
    {
        string v = Request.QueryString["value1"];
        ds = new DataSet();
        string sql = "select photo FROM joining where refno='" + v + "' ";
        da = new OleDbDataAdapter(sql, con);
        da.Fill(ds, "joining");
        DataRow dRow = ds.Tables["joining"].Rows[0];
        txtPhoto.Text = dRow["photo"].ToString();
    }
    com = con.CreateCommand();
    if (con != null)
    {
        com.CommandText = "UPDATE joining SET aname = '" + txtName.Text.Trim() + "',fathname='" + txtFather.Text.Trim() + "',dob='" + txtDOB.Text.Trim() + "',pob='" + txtPOB.Text.Trim() + "',add1='" + txtAdd.Value + "',mob='" + txtMob.Text.Trim() + "',city='" + txtCity.Text.Trim() + "',state='" + txtState.Text.Trim() + "',pcode='" + txtPCode.Text.Trim() + "',panno='" + txtPAN.Text.Trim() + "',nominee='" + txtNominee.Text.Trim() + "',relation='" + txtRelation.Text.Trim() + "',photo='" + txtPhoto.Text.Trim() + "',bank='" + txtBank.Text.Trim() + "',branch='" + txtBranch.Text.Trim() + "',account='" + txtAccount.Text.Trim() + "',acctype='" + ddAccType.SelectedItem.Text + "',intby='" + txtIntro.Text.Trim() + "',codno='" + txtCodno.Text.Trim() + "',agent='" + txtACode.Text.Trim() + "',point='" + txtPoints.Text.Trim() + "' where refno='" + txtRefNo.Text.Trim() + "'";
        try
        {
            int count = com.ExecuteNonQuery();
            System.Web.UI.WebControls.Label lbl1 = new System.Web.UI.WebControls.Label();
            lbl1.ForeColor = System.Drawing.Color.Yellow;
            lbl1.BackColor = System.Drawing.Color.Blue;
            lbl1.Text = "Your record UPDATED sucessfully";
            ph1.Controls.Add(lbl1);
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
    }
    con.Close();
}