How to Make textbox autocomplete?

Thank u sanforjackass thats help me alot.

i tried this gridview1.Rows.Add(); gridview1.DataSource = ds; this exception No row can be added to a DataGridView control that does not have columns. Columns must be added first.

I have agridview i fill it from datatable but i want to add new emptyrow af first before filling

I have agridview i fill it from datatable but i want to add new emptyrow af first before filling