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.

How can I show the sum of the Amount Column in a Label Control as "Total Amount"?

Answer 1

To calculate the sum of a column in a DataTable use the DataTable.Compute method.

Example of usage from the linked MSDN article:

DataTable table = dataSet.Tables["YourTableName"];  // Declare an object variable. object sumObject; sumObject = table.Compute("Sum(Amount)", string.Empty); 

Display the result in your Total Amount Label like so:

lblTotalAmount.Text = sumObject.ToString(); 

Answer 2

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

If you want to filter the results:

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