how to retrieve value in datagridview by autocomplete text

Question

Iam creating one application where medicine_name is autocomplete text, base on that selection i want to populate Expiry_Date but whenever i run the code its given me Index was outside the bounds of the array exception, retrieve code i written on dataGridView1_CellEndEdit event i dont know where is im wrong here im pasting my code and screen shots of application and table structure

 

private void dataGridView1_CellEndEdit_1(object sender, DataGridViewCellEventArgs e)

{

string connectionString = null;

connectionString = ConfigurationManager.ConnectionStrings["AccessConnectionString"].ConnectionString;

con.ConnectionString = connectionString;

string medicinename = Convert.ToString(dataGridView1.Rows[e.RowIndex].Cells["Medicine_name"].Value);

DateTime Expiry_Date = Convert.ToDateTime (dataGridView1.Rows[e.RowIndex].Cells["Expiry_Date"].Value);

con.Open();

cmd = new OleDbCommand("select Expiry_Date from Medicine_Available_Detail where Medicine_Name='" + medicinename + "'", con);

OleDbDataReader dr = cmd.ExecuteReader();

while (dr.Read())

{

Expiry_Date = Convert.ToDateTime (dr.GetValue(5));// exeception coming on this line

}

con.Close();

}