Datagridview in c#

Here is the my code to add columns to datagridview runtime :

DataGridViewComboBoxColumn c5 = new DataGridViewComboBoxColumn();

c5.HeaderText = "Item_SrNo";

con.connCheck();

OleDbCommand cmd = new OleDbCommand("select Item_SrNo from Item_Master", con.cn);

OleDbDataReader dr = cmd.ExecuteReader();

while (dr.Read()==true)

{

c5.Items.Add(dr["Item_SrNo"].ToString());

}

dataGridView1.Columns.Add(c5);

DataTable dt = new DataTable();

dt.Columns.Add(new DataColumn("Item_Code", typeof(string)));

dt.Columns.Add(new DataColumn("Sale_Unit", typeof(string)));

dt.Columns.Add(new DataColumn("Inventory_Rate", typeof(int)));

dataGridView1.DataSource = dt;

Here when i press 'enter' in datagridview then comboBox list dropdowns Please Help me...

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