hi AnandM

I change code like:

  protected void BindDropDownList1(DropDownList DDL, string spname, string dataTextfield, string dataValuefield)

    {

        using (SqlConnection conn = General.GetConnection())
        {
            using (SqlCommand _cmd = General.GetCommand(spname, conn))
            {
                if (DDL.ID.ToUpper() != ddlzone.ToUpper()) // pass the dropdownlist Id which you want to bind in perisan numbering.
                {
                    conn.Open();
                    SqlDataReader _dr = _cmd.ExecuteReader();
                    if (_dr.HasRows)
                    {
                        DDL.DataSource = _dr;
                        DDL.DataTextField = dataTextfield;
                        DDL.DataValueField = dataValuefield;
                        DDL.DataBind();
                    }
                    conn.Close();
                }
                else
                {
                    DataTable dtPersianTable = new DataTable();
                    dtPersianTable.Columns.Add("persian");
                    SqlDataAdapter sda = new SqlDataAdapter(_cmd);
                    DataTable dtDataBaseTable = new DataTable();
                    sda.Fill(dtDataBaseTable);
                    for (int i = 0; i < dtDataBaseTable.Rows.Count; i++)
                    {
                        dtPersianTable.Rows.Add(toPersianNumber(dtDataBaseTable.Rows[i]["Regionname"].ToString())); // table column name which holds the value in numbers needs to be converted to persian.
                    }
                    DDL.DataSource = dtPersianTable;
                    DDL.DataTextField = "persian";
                    DDL.DataValueField = "persian";
                    DDL.DataBind();
                }
            }
        }
    }

but make below error:

Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS1061: 'DropDownList' does not contain a definition for 'ToUpper' and no extension method 'ToUpper' accepting a first argument of type 'DropDownList' could be found (are you missing a using directive or an assembly reference?) Source Error:

Line 74:             using (SqlCommand _cmd = General.GetCommand(spname, conn))
Line 75:             {
Line 76:                 if (DDL.ID.ToUpper() != ddlzone.ToUpper()) // pass the dropdownlist Id which you want to bind in perisan numbering.
Line 77:                 {
Line 78:                     conn.Open();