Adding newrow in datatable slow down performance. How to improve performance ?

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C#

I adding new row in datatable by c#, but it slows down the application performance, please suggest which is fastest way to add new row in datatable without compromising performance.

Thanks in Advance.

What I have tried:

I tried
List newRow = new List();
//code to add values in list
newRow.Add('10001');
datatable.Rows.Add(newRow.ToArray());

also tried
DataRow newRow = datatable.NewRow();
newRow[0] = '10001';
datatable.Rows.Add(newRow);