Adding Row to gridview in devexpress from textbox values

I have a form where i have some text boxes and a Gridview(with Columns in it).the values entered in textboxes should be added as a row in gridview when pressing a ADD button..below is the code in the click event of ADD button..It add as a single column not as a row..Please help me with this.

BindingList<string> Grid_data = new BindingList<string>(); 
Grid_data.Add(txtMaterial.Text.ToString());
Grid_data.Add(txtPlastic.Text.ToString());
Grid_data.Add(txtCoatingtype.Text.ToString());
Grid_data.Add(txtManufacturer.Text.ToString());
Grid_data.Add(txtManuDate.Text.ToString());
Grid_data.Add(txtLineSize.Text.ToString());
Grid_data.Add(txtFootage.Text.ToString());
DGMaterial.DataSource = Grid_data;
GV_Material.PopulateColumns();

it adds as a column to the grid..

Tags: DevExpress