put the System.Windows.Form.ComboBox in Datagridview C# windows application

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C#3.5

DataGridView

private void dataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
{
if (dataGridView1.CurrentCell.ColumnIndex==0)
{
//SendKeys.Send("{F2}");
dataGridView1.BeginEdit(true);
comboBox1.Visible = true;
comboBox1.Location = dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, true).Location;
comboBox1.Size = dataGridView1.CurrentCell.Size;
comboBox1.Focus();
}
}

dataGridView1.BeginEdit(true);

if i use above code then combobox dropdown property is not working

SendKeys.Send("{F2}");

if use this combo is not available in firstRow for editmode on keypress