There are 2 ways to add Rows into any DataTable.
For Example:
1st way:-//Directly using DataTable Row' Add static method
DataTable dt_employee = new DataTable();
dt_employee.Columns.Add("Name");
dt_employee.Columns.Add("Address");
dt_employee.Rows.Add("Vishal","Neeraj");
2nd way:-//DataTable NewRow() method with DataRow
DataRow dr_employee = null;
//assign values based on column indexes
dr_employee = dt_employee.NewRow();
dr_employee[0] = "Rajesh";
dr_employee[1] = "Nagpur";
dt_employee.Rows.Add(dr_employee);
//or assign values by using column names
dr_employee = dt_employee.NewRow();
dr_employee["Name"] = "Nitin";
dr_employee["Address"] = "Indore";
dt_employee.Rows.Add(dr_employee);