Running Total In Gridview Footer In ASP.NET C# VB.NET

In this example i am going to demonstrate how to Display Running Total In GridView Footer Row In ASP.NET using C# and VB.NET. This method works with paging enabled gridview as well.

For demo purpose gridview is populated using sqldatasource having table with columns ID ,Name,Amount

I m showing total of amount column is gridview footer. for this we need to sum the the column in RowDataBound Even of Gridiew

Html source of gridview is

<asp:GridView ID="GridView1" runat="server" 
              AutoGenerateColumns="False"
              DataKeyNames="ID" DataSourceID="SqlDataSource1" 
              OnRowDataBound="GridView1_RowDataBound" 
              ShowFooter="True" AllowPaging="True" PageSize="5" 
              BackColor="#ffffff" BorderColor="AliceBlue" 
              BorderStyle="None" BorderWidth="1px" 
              CellPadding="3" 
              CellSpacing="2" FooterStyle-BackColor="#da821e" 
              FooterStyle-ForeColor="#ffffff" 
              RowStyle-BackColor="#003366" 
              RowStyle-ForeColor="#ffffff" 
              AlternatingRowStyle-BackColor="#da821e">
<Columns>
     <asp:BoundField DataField="ID" HeaderText="ID" 
                     InsertVisible="False" ReadOnly="True"
                     SortExpression="ID" />
     <asp:BoundField DataField="Name" HeaderText="Name" 
                     InsertVisible="False" ReadOnly="True"
                     SortExpression="Name" FooterText="Total"/>
     <asp:TemplateField HeaderText="Amount">
     <ItemTemplate>
     <asp:Label ID="lblAmount" runat="server" 
                Text='<%# "$"+Eval("Amount").ToString()%>'>
     </asp:Label>
     </ItemTemplate>
     <FooterTemplate>
     <asp:Label ID="lblTotal" runat="server"></asp:Label>
     </FooterTemplate>
     </asp:TemplateField>
     </Columns>
     <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
     <HeaderStyle BackColor="#da821e" Font-Bold="True" 
                  ForeColor="White" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [ID], [Name], [Amount] FROM [Expenses]">
</asp:SqlDataSource>

Now we need to write code for summing the column in RowdataBound Even of GridView

C# code behind

public partial class _Default : System.Web.UI.Page 
{
    decimal grdTotal = 0;
    protected void Page_Load(object sender, EventArgs e)
    {

    }
protected void GridView1_RowDataBound
                   (object sender, GridViewRowEventArgs e)
{
 if (e.Row.RowType == DataControlRowType.DataRow)
 {
  decimal rowTotal = Convert.ToDecimal
              (DataBinder.Eval(e.Row.DataItem, "Amount"));
  grdTotal = grdTotal + rowTotal;
 }
 if (e.Row.RowType == DataControlRowType.Footer)
 {
  Label lbl = (Label)e.Row.FindControl("lblTotal");
  lbl.Text = grdTotal.ToString("c");
 }
}
}

VB.NET code behind

Public Partial Class _Default
    Inherits System.Web.UI.Page
    Private grdTotal As Decimal = 0
    Protected Sub Page_Load
    (ByVal sender As Object, ByVal e As EventArgs)
        
End Sub

Protected Sub GridView1_RowDataBound
(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

If e.Row.RowType = DataControlRowType.DataRow Then
Dim rowTotal As Decimal = 
Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "Amount"))
grdTotal = grdTotal + rowTotal
End If

If e.Row.RowType = DataControlRowType.Footer Then
Dim lbl As Label = DirectCast(e.Row.FindControl
                           ("lblTotal"), Label)
lbl.Text = grdTotal.ToString("c")
End If
End Sub
End Class

Hope this helps

Other gridview articles:
Populating dropdown based on the selection of first drop down in DetailsView using FindControl and ItemTemplate

Pouplating Multiple DetailsView based on single GridView using DataKeyNames

Merging GridView Headers to have multiple Headers in GridView

Search Records In GridView And Highlight Results Using AJAX ASP.NET

Insert update Delete record in GridView using SqlDataSource ItemTemplate and EditItemTemplate