How to calculate the sum of the datatable column in asp.net?

Question

I have a DataTable which has 5 columns:

• ID
• Name
• Account Number
• Branch
• Amount

The DataTable contains 5 rows.

Answer 1

 this.LabelControl.Text = datatable.AsEnumerable()
    .Sum(x => x.Field("Amount"))
    .ToString();

If you want to filter the results:

 this.LabelControl.Text = datatable.AsEnumerable()
    .Where(y => y.Field("SomeCol") != "foo")
    .Sum(x => x.Field("MyColumn") )
    .ToString();