when i click the button i want to show the data from the database and display into the datagridview using oledb

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C#

when i click the button i want to show the data from the database and display into the datagridview using oledb.

for that code as follows;

       private GlobalFunction GFun = new GlobalFunction();
       private OleDbDataReader oledr;
       private string sql;



  private void Btn_View_Course_Click(object sender, EventArgs e)
     {
       try
       {
 GFun.BindAccessConn();
 sql = "select * from Tb_SCh_TIme_Table where Course = '" +  cb_Course_Name.Text.ToString().Trim() + "'  order by Date,session";
OleDbCommand cmd = new OleDbCommand(sql,GFun.OleDbCon);
cmd.CommandType = CommandType.Text;
OleDbDataAdapter oleda = new OleDbDataAdapter(cmd);
DataTable dt = new DataTable();
oleda.Fill(dt);
DGV_Course_report.DataSource = dt;
 catch (Exception ex1)
          {
  MessageBox.Show(ex1.ToString(), "Error", MessageBoxButtons.OK);
           }
     }

when i click the button in datagridview records not display.why.

i use the OLEDB conncection.

how can i do.

help me.