Binding Data to a grid view

Question

this code below gives me an error DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'CourseName'. am hoping to get a solution to it thanks

 

using System;

using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class CourseRegistration : System.Web.UI.Page
{
Connector newconnect = new Connector();

protected void Page_Load(object sender, EventArgs e)
{
if (Session["Student"] != null)
{
try
{
string matricno = Session["Student"].ToString();

if (!IsPostBack)
{
GridView1.DataSource = GetData("select CourseRegistration.CourseCode, CoursesTable.CourseName, CoursesTable.CourseUnit from (DepartmentTable inner join CoursesTable on DepartmentTable.DepartmentID=CoursesTable.DepartmentID) inner join CourseRegistration on CoursesTable.CourseCode = CourseRegistration.CourseCode where MatricNo = '" + matricno + "'");
GridView1.DataBind();
}
}
catch (Exception ex)
{
Label1.Text = ex.Message;
}
}

}

private DataSet GetData(string query)
{
string matricno = Session["Student"].ToString();
string conString = ConfigurationManager.ConnectionStrings["OnlineExamination_String"].ConnectionString;
SqlCommand cmd = new SqlCommand(query);
using (SqlConnection con = new SqlConnection(conString))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataSet ds = new DataSet())
{
sda.Fill(ds);
return ds;
}
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
string matricno = Session["Student"].ToString();

SqlCommand command = new SqlCommand();
command = newconnect.HelpCommand("CourseChecker");
command.Parameters.AddWithValue("@MatricNo", matricno);
command.Parameters.AddWithValue("@CourseCode", DropDownList3.SelectedValue);
SqlDataReader rv = command.ExecuteReader();
if (rv.HasRows == false)
{

try
{
SqlCommand commander = new SqlCommand();
commander = newconnect.HelpCommand("CourseRegInsert");
commander.Parameters.AddWithValue("@MatricNo", matricno);
commander.Parameters.AddWithValue("@CourseCode", DropDownList3.SelectedValue);
commander.Parameters.AddWithValue("@Session", DropDownList4.SelectedValue);
commander.ExecuteNonQuery();
}
catch (Exception ex)
{
Label1.Text = ex.Message;
}
}
else
{

}
}
}