Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

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ASP.NET

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

The above error is seen in my code give below.

Can any one help me?

SqlCommand CMD = new SqlCommand("select productname from addproduct", con);
            dr = CMD.ExecuteReader();
            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    DropDownList drp = new DropDownList();
                    drp.Items.Add(dr.GetValue(0).ToString());
                    for (int i = 0; i <= drp.Items.Count; i++)
                    {
                        //getting above error at below line 
                        GridView1.Rows[i].Cells[1].Text = dr.GetValue(0).ToString();

Actually I'm trying here to bind data from database to drop down inside the grid view.