Conver date to persian/arabic date inside GridView using C# in ASP.Net

Hi nedash,

Refer the below code.

HTML

<div>
    <asp:GridView runat="server" ID="gvConverNumericDigitToPersian" AutoGenerateColumns="false">
        <Columns>
            <asp:TemplateField HeaderText="Tell" ItemStyle-Width="110px" ItemStyle-HorizontalAlign="Center"
                ItemStyle-VerticalAlign="Middle">
                <ItemTemplate>
                    <asp:Label ID="lblCustomerID" runat="server" Text='<%#toPersianNumber(Eval("Tell").ToString())%>'
                        CssClass="lblpey"></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Date" ItemStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle">
                <ItemTemplate>
                    <asp:Label ID="Label11" runat="server" CssClass="lbldateS" Text='<%#toPersianNumber(miladitoshamsi(Eval("Date").ToString()))%>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[2] { new DataColumn("Tell", typeof(int)), new DataColumn("Date", typeof(DateTime)) });
        dt.Rows.Add(12345, "2016/10/25");
        dt.Rows.Add(15648, "2016/10/23");
        dt.Rows.Add(15478, "2016/10/22");
        dt.Rows.Add(13982, "2016/10/21");
        gvConverNumericDigitToPersian.DataSource = dt;
        gvConverNumericDigitToPersian.DataBind();
    }
}

public string toPersianNumber(string input)
{
    string[] persian = new string[10] { "۰", "۱", "۲", "۳", "۴", "۵", "۶", "۷", "۸", "۹" };
    for (int j = 0; j < persian.Length; j++)
    {
        input = input.Replace(j.ToString(), persian[j]);
    }

    char[] charArray = input.ToCharArray();
    Array.Reverse(charArray);
    return new string(charArray);
}

public string miladitoshamsi(object miladi1)
{
    DateTime miladi = Convert.ToDateTime(miladi1);
    System.Globalization.PersianCalendar shamsi = new System.Globalization.PersianCalendar();
    return string.Format("{0}/{1}/{2} {3}:{4}:{5}", shamsi.GetYear(miladi), shamsi.GetMonth(miladi), shamsi.GetDayOfMonth(miladi), shamsi.GetHour(miladi), shamsi.GetMinute(miladi), shamsi.GetSecond(miladi));
}

OutPut