//Create the DataTable
DataTable dt = new DataTable();

//Creating a blank row
DataRow BlankRow = dt.NewRow();

//Insert the columns
BlankRow[ "PlantName" ] = Plant;
BlankRow[ "Capital"] = Capital;

//Insert the row at the desired place
dt.Rows.InsertAt ( BlankRow, dt.Rows.Count + 1 );

//exception
//you can also insert the columns with blank data 
BlankRow[ "PlantName" ] = "";
BlankRow[ "Capital"] = "";