how to implement to put cama(,) between the numbers in gridview

try this sample code

<asp:GridView AutoGenerateColumns="false" ID="GridView1" runat="server">

            <Columns>

                <asp:BoundField DataField="amount"  DataFormatString="{0:N}" />
            </Columns>

        </asp:GridView>




   
             DataTable dt = new DataTable();
                dt.Columns.Add("amount",typeof(double));
                dt.Rows.Add(123456789);
                dt.Rows.Add(3434);
                dt.Rows.Add(656565665);

                GridView1.DataSource = dt;
                GridView1.DataBind();

Custom Numeric Format Strings

This can be done using the "," Custom Specifier,[http://msdn.microsoft.com/en-us/library/0c899ak8.aspx[^]] which can be used as a number scaling specifier:

"


Group separator and number scaling


Serves as both a group separator and a number scaling specifier. As a group separator, it inserts a localized group separator character between each group. As a number scaling specifier, it divides a number by 1000 for each comma specified.

More information: The "," Custom Specifier.


Group separator specifier:

2147483647 ("##,#", en-US) -> 2,147,483,647

2147483647 ("##,#", es-ES) -> 2.147.483.647

Scaling specifier:

2147483647 ("#,#,,", en-US) -> 2,147

2147483647 ("#,#,,", es-ES) -> 2.147

use this to convert into amount

using System.Globalization; //namespace


System.Globalization.CultureInfo culInfo = new System.Globalization.CultureInfo("hi-IN");//globally

lbltotal.Text = amount.ToString("C", culInfo).Remove(0, 2).Trim();

In your row databound event of gridview firstly get value of that cell to which you want to show as comma separted
then assign it back to that cell by formatting it like below



//value=gridview cell value

value.ToString("#,#", CultureInfo.InvariantCulture)

gridview cellvalue=value;

N or n:
Displays numeric values in number format (including group separators and optional negative sign). You can specify the number of decimal places.

DataFormatString="{0:N}"

Get More Details

system.web.ui.webcontrols.boundfield.dataformatstring