How can we insert row at runtime

//Create a DataTable instance
DataTable table = new DataTable();
//Create columns for this DataTable
DataColumn col1 = new DataColumn("ID");
//Define DataType of the Columns
col1.DataType = System.Type.GetType("System.Int");
//Add All These Columns into DataTable table
table.Columns.Add(col1);
//Create a Row in the DataTable table
DataRow row = table.NewRow();
//Fill All Columns with Data
row[col1] = 1;
//Add the Row into DataTable
table.Rows.Add(row);
//Bind this DataTable to a GridView
gvTest.DataSource = table;
gvTest.DataBind();