How to add new DataRow into DataTable?

You can try with this code – based on Rows.Add method

DataTable table = new DataTable();
DataRow row = table.NewRow();
table.Rows.Add(row);

Reference: https://learn.microsoft.com/dotnet/api/system.data.datarowcollection.add?view=net-5.0#System_Data_DataRowCollection_Add_System_Data_DataRow_