Данные хранятся в наборе данных, но не могут связать данные

con = new SqlConnection(conn);
con.Open();
DataSet ds = new DataSet();
// DataTable dt = new DataTable();
da = new SqlDataAdapter("SELECT cc.courseCATId ,cm.CourseName,cc.CourseCatName ,cc.CourseDur,cc.CourseFee   FROM CourseCat cc INNER JOIN courseMaster cm  ON cc.courseId =cm.courseId  ORDER BY cc.courseId", con);
da.Fill(ds);

//MessageBox.Show(ds.Tables[0].Rows.Count.ToString() );
// dataGridView2.DataSource = null;
dataGridView2.AutoGenerateColumns = false;
dataGridView2.ColumnCount = 5;
dataGridView2.Columns[0].Name = "Course catID";
dataGridView2.Columns[0].HeaderText = "Category  ID";
dataGridView2.Columns[0].DataPropertyName = "cc.courseCATId";

dataGridView2.Columns[1].Name = "Course Name";
dataGridView2.Columns[1].HeaderText = "Course Name";
dataGridView2.Columns[1].DataPropertyName = "cm.CourseName";
dataGridView2.Columns[2].Name = "Course cat Name";
dataGridView2.Columns[2].HeaderText = "Category Name";
dataGridView2.Columns[2].DataPropertyName = "cc.CourseCatName";
dataGridView2.Columns[3].Name = "Course Duration";
dataGridView2.Columns[3].HeaderText = "Course Duration";
dataGridView2.Columns[3].DataPropertyName = "cc.CourseDur";
dataGridView2.Columns[4].Name = "Course Fee";
dataGridView2.Columns[4].HeaderText = "Course Fee";
dataGridView2.Columns[4].DataPropertyName = "cc.CourseFee";
dataGridView2.DataSource = ds;
con.Close();

data hold in data set but could not bind data