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

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

You can do like..

DataRow[] dr = dtbl.Select("SUM(Amount)");
txtTotalAmount.Text = Convert.ToString(dr[0]);

Answer 3

  public decimal Total()
    {
      decimal decTotal=(datagridview1.DataSource as DataTable).Compute("Sum(FieldName)","");
      return decTotal;
    }