Update queries not updating records and also not giving any error

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C#

Update queries not updating records and also not giving any error.But this programe is fetching records during page load but when i want to update that records it is not working and also not giving error.Please help me.

If some setting for folder which have all files or mdb file for the update query please also mention.



<%@Import Namespace="System.Data"%>
<%@Import Namespace="System.Data.OleDb"%>
<%@Page Language="C#" Debug="true" %>
<script runat="server">
OleDbConnection con;
OleDbCommand com;
OleDbDataAdapter da;
DataSet ds;
void page_Load(Object sender,EventArgs e)
{
con=new OleDbConnection();
con.ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("~/kamnagroup.mdb") + "";
con.Open();
ds=new DataSet();
string sql="select aname,fathname,refno FROM joining";
da=new OleDbDataAdapter(sql,con);
da.Fill(ds,"joining");
DataRow dRow=ds.Tables["joining"].Rows[0];
t1.Text =dRow.ItemArray.GetValue(0).ToString();
t2.Text = dRow.ItemArray.GetValue(1).ToString();
t3.Text = dRow.ItemArray.GetValue(2).ToString();
con.Close();
}
void Submit(Object s, EventArgs e)
{con.Close();
con.Open();
ds=new DataSet();
com=con.CreateCommand();
com.CommandText="UPDATE joining SET aname = '" + t1.Text.Trim() + "',fathname='" + t2.Text.Trim() + "' where refno='" + t3.Text.Trim() + "'";
com.CommandText="UPDATE joining SET aname = @NAME,fathname=@FATHER WHERE refno=@REFNO";
com.Parameters.AddWithValue("@NAME",t1.Text.Trim());
com.Parameters.AddWithValue("@FATHER",t2.Text.Trim());
com.Parameters.AddWithValue("@REFNO",t3.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();
}
</script>