DataGridView Default Error Dialog --------------------------- The following exception occurred in the DataGridView: System.ArgumentException: DataGridViewComboBoxCell value is not valid.

Question

Here is the code

 string tbname = comboBox1.SelectedItem.ToString();

           OleDbConnection con = new OleDbConnection("provider=Microsoft.jet.oledb.4.0;data source=N:\\DB\\SampleData.mdb;");

                conn.Open();

            dataGridView1.Rows.Clear();

            OleDbConnection con = new OleDbConnection("provider=Microsoft.jet.oledb.4.0;data source=N:\\DB\\SampleData.mdb;");

            con.Open();

  DataTable dt = conn.GetSchema("Tables");

string tbname = textBox1.Text;

                        dataGridView1.Rows.Clear();

            OleDbDataAdapter ad = new OleDbDataAdapter("Select * from" + " " + tbname + " ", con);

            DataTable dt = new DataTable();

            ad.Fill(dt);

            int j = 0;

          

            for (int i = 0; i < dt.Columns.Count; i++) //Getting Columns Name present in the table

            {

                dataGridView1.Rows.Insert(i, "");

                dataGridView1.Rows.Insert(i, "");

                            cname[i] = dt1.Columns[i].ColumnName;

                             cname1[j] =Convert.ToString(dt.Columns[i].DataType);

 dataGridView1.Rows[i].Cells[0].Value = cname[i];

 dataGridView1.Rows[i].Cells["DATA_TYPE"].Value = cname1[j];//here i want populate data types in combobox //Here i'm getting error like above what i asked

                            j++;

            }

           // comboBox4.SelectedIndex = 0;  

            con.Close();