i think u can try this
add a combobox from the datagridtasks by add column and select comboxcontrol from type,it will in the particuler column cell
and then try like this sample
With DataGridView1
' Set DataGridView Combo Column for CarID field
Dim ColumnCar As New DataGridViewComboColumn
' DataGridView Combo ValueMember field has name "CarID"
' DataGridView Combo DisplayMember field has name "Car"
With ColumnCar
.DataPropertyName = "CarID"
.HeaderText = "Car Name"
.Width = 80
' Bind ColumnCar to Cars table
.box.DataSource = ds.Tables("Cars")
.box.ValueMember = "CarID"
.box.DisplayMember = "Car"
End With
.Columns.Add(ColumnCar)
End With