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

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"?

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();

 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();

You can do like..

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

If you have a ADO.Net DataTable you could do

int sum = 0;
foreach(DataRow dr in dataTable.Rows)
{
   sum += Convert.ToInt32(dr["Amount"]);
}

If you want to query the database table, you could use

Select Sum(Amount) From DataTable

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

Compute Sum of Column in Datatable , Works 100%

lbl_TotaAmt.Text = MyDataTable.Compute("Sum(BalAmt)", "").ToString();

if you want to have any conditions, use it like this

   lbl_TotaAmt.Text = MyDataTable.Compute("Sum(BalAmt)", "srno=1 or srno in(1,2)").ToString();

You Can use Linq by Name Grouping

  var allEntries = from r in dt.AsEnumerable()
                            select r["Amount"];

using name space using System.Linq;

You can find the sample total,subtotal,grand total in datatable using c# at Myblog

Try this

int sum = 0;
foreach (DataRow dr in dt.Rows)
{
     dynamic value = dr[index].ToString();
     if (!string.IsNullOrEmpty(value))
     { 
         sum += Convert.ToInt32(value);
     }
}

I think this solves

using System.Linq;


(datagridview1.DataSource as DataTable).AsEnumerable().Sum(c => c.Field<double>("valor"))

If you're wanting to do this within your cshtml file, you can write it like this (including a LAMBDA expression):

<td><b>£@Model.Sum(i => i.Amount)</b></td>

You can remove the html tags, I just left them in to try and help with the example.