Change A TextBox To Combo Box In DataGridView At Run Time

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C#

combobox

DataGridView

First,i should say i searched a lot but i didnt find my solution

i did these works:

1.

this.dataGridView1[1, 1] = new DataGridViewComboBoxCell();

Got This Error :

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

2.

DataGridViewComboBoxCell dgv_cbcell=new DataGridViewComboBoxCell();
dgv_cbcell.Value = null;
dataGridView1.Rows[e.RowIndex].Cells[2] = dgv_cbcell;
dataGridView1.Rows[e.RowIndex].Cells[2].ValueType = dgv_cbcell.ValueType;

Got This Error :

DataGridViewComboBoxCell value is not valid