Gridview Cell splitting

Question

Please Explain the below statement:

 

GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal); 

 

 

TableHeaderCell cell = new TableHeaderCell();

cell.Text = "Customers";

cell.ColumnSpan = 2;

row.Controls.Add(cell);

 

GridView1.HeaderRow.Parent.Controls.AddAt(0, row); 

 

Thank you.