Chart Not Visible in c# .net

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C#

Am not getting the graph its not visible the series values and everything i have entered correctly Help me pls

try
{
    // chart1.Titles.Add("SERVICE AREA CALCULATION");
    da = new SqlDataAdapter("select * from timer ", cn.con);
    DataSet ds = new DataSet();
    ds.Clear();
    da.Fill(ds, "timer");
    DataView dv = new DataView(ds.Tables["timer"]);
    chart1.Series["Timer"].Points.DataBindXY(dv, "oldtime", dv, "numofvmused");
    chart1.Series["Fire Timer"].Points.DataBindXY(dv, "numofvmused", dv, "numofvmused");


}
catch (Exception error)
{
}

Thank You...