this my aspx page
<%@ Page Language="C#" MasterPageFile="~/Admin/AdminMasterPage.master" AutoEventWireup="true" CodeFile="MailDemo.aspx.cs" Inherits="Admin_MailDemo" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentAdmin" Runat="Server">
<asp:gridview ID="MailGrid" runat="server" ShowFooter="true" HeaderStyle-CssClass="GridHeadCenter"
AutoGenerateColumns="false" OnRowDataBound="MailGrid_RowDataBound">
<Columns>
<asp:BoundField DataField="RowNumber" HeaderText="Sr.No." />
<asp:TemplateField HeaderText="Report">
<ItemTemplate>
<asp:DropDownList ID="ddlReport" runat="server"
CssClass="DropDown">
<asp:ListItem Value="-1">Select</asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Time Frame">
<ItemTemplate>
<asp:DropDownList ID="ddl_TimeFrame" runat="server" CssClass="DropDown">
<asp:ListItem Selected="True" Text="Daily Once" Value="D"></asp:ListItem>
<asp:ListItem Text="Weekly Once" Value="W"></asp:ListItem>
<asp:ListItem Text="Forthnightly" Value="F"></asp:ListItem>
<asp:ListItem Text="Monthly Once" Value="M"></asp:ListItem>
<asp:ListItem Text="Quarterly Once" Value="Q"></asp:ListItem>
<asp:ListItem Text="Yearly Once" Value="Y"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Type of Attachement">
<ItemTemplate>
<asp:DropDownList ID="ddl_Attachement" runat="server" CssClass="DropDown">
<asp:ListItem Selected="True" Text="XLS" Value="XLS"></asp:ListItem>
<asp:ListItem Text="PDF" Value="PDF"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Template">
<ItemTemplate>
<asp:DropDownList ID="ddlTemplate" runat="server" CssClass="DropDown" DataTextField="TemplateName" DataValueField="TemplateId">
</asp:DropDownList>
</ItemTemplate>
<FooterStyle HorizontalAlign="Right" />
<FooterTemplate>
<asp:Button ID="ButtonAdd" runat="server"
Text="Add New Row" CssClass="SaveButton" Width="100"
onclick="ButtonAdd_Click" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:gridview>
</asp:Content>
----
this is my .cs page
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Admin_MailDemo : System.Web.UI.Page
{
Admin ObjAdmin = new Admin();
Transaction TrObj = new Transaction();
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
SetInitialRow();
}
}
//private ArrayList GetDummyData()
//{
// ArrayList arr = new ArrayList();
// arr.Add(new ListItem("Item1", "1"));
// arr.Add(new ListItem("Item2", "2"));
// arr.Add(new ListItem("Item3", "3"));
// arr.Add(new ListItem("Item4", "4"));
// arr.Add(new ListItem("Item5", "5"));
// return arr;
//}
//private void FillDropDownList(DropDownList ddl)
//{
// ArrayList arr = GetDummyData();
// foreach (ListItem item in arr)
// {
// ddl.Items.Add(item);
// }
//}
public void SetInitialRow()
{
//int i;
//i = 0;
DataTable dt = new DataTable();
DataRow dr = null;
dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
dt.Columns.Add(new DataColumn("Column1", typeof(string)));//for DropDownList selected item
dt.Columns.Add(new DataColumn("Column2", typeof(string)));//for DropDownList selected item
dt.Columns.Add(new DataColumn("Column3", typeof(string)));//for DropDownList selected item
dt.Columns.Add(new DataColumn("Column4", typeof(string)));//for DropDownList selected item
dr = dt.NewRow();
dr["RowNumber"] =1;
dr["Column1"] = string.Empty;
dr["Column2"] = string.Empty;
dt.Rows.Add(dr);
//Store the DataTable in ViewState for future reference
ViewState["CurrentTable"] = dt;
//Bind the Gridview
MailGrid.DataSource = dt;
MailGrid.DataBind();
//After binding the gridview, we can then extract and fill the DropDownList with Data
//DropDownList ddlTemplate = (DropDownList)MailGrid.Rows[0].Cells[6].FindControl("ddlTemplate");
//DropDownList ddlReport = (DropDownList)MailGrid.Rows[0].Cells[3].FindControl("ddlReport");
//FillDropDownList(ddlTemplate);
//FillDropDownList(ddlReport);
}
private void AddNewRowToGrid()
{
if (ViewState["CurrentTable"] != null)
{
DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
DataRow drCurrentRow = null;
if (dtCurrentTable.Rows.Count > 0)
{
drCurrentRow = dtCurrentTable.NewRow();
drCurrentRow["RowNumber"] = dtCurrentTable.Rows.Count + 1;
//add new row to DataTable
dtCurrentTable.Rows.Add(drCurrentRow);
//Store the current data to ViewState for future reference
ViewState["CurrentTable"] = dtCurrentTable;
for (int i = 0; i < dtCurrentTable.Rows.Count - 1; i++)
{
//extract the DropDownList Selected Items
DropDownList ddlReport = (DropDownList)MailGrid.Rows[i].Cells[1].FindControl("ddlReport");
DropDownList ddl_TimeFrame = (DropDownList)MailGrid.Rows[i].Cells[2].FindControl("ddl_TimeFrame");
dtCurrentTable.Rows[i]["Column1"] = ddlReport.SelectedItem.Text;
dtCurrentTable.Rows[i]["Column2"] = ddl_TimeFrame.SelectedItem.Text;
DropDownList ddl_Attachement = (DropDownList)MailGrid.Rows[i].Cells[3].FindControl("ddl_Attachement");
DropDownList ddlTemplate = (DropDownList)MailGrid.Rows[i].Cells[4].FindControl("ddlTemplate");
// Update the DataRow with the DDL Selected Items
dtCurrentTable.Rows[i]["Column3"] = ddl_Attachement.SelectedItem.Text;
dtCurrentTable.Rows[i]["Column4"] = ddlTemplate.SelectedItem.Text;
}
//Rebind the Grid with the current data to reflect changes
MailGrid.DataSource = dtCurrentTable;
MailGrid.DataBind();
}
}
else
{
Response.Write("ViewState is null");
}
//Set Previous Data on Postbacks
SetPreviousData();
}
private void SetPreviousData()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dt = (DataTable)ViewState["CurrentTable"];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
DropDownList ddlReport = (DropDownList)MailGrid.Rows[i].Cells[1].FindControl("ddlReport");
DropDownList ddl_TimeFrame = (DropDownList)MailGrid.Rows[i].Cells[2].FindControl("ddl_TimeFrame");
DropDownList ddl_Attachement = (DropDownList)MailGrid.Rows[i].Cells[3].FindControl("ddl_Attachement");
DropDownList ddlTemplate = (DropDownList)MailGrid.Rows[i].Cells[4].FindControl("ddlTemplate");
//Fill the DropDownList with Data
//FillDropDownList(ddl1);
//FillDropDownList(ddl2);
if (i < dt.Rows.Count - 1)
{
//Set the Previous Selected Items on Each DropDownList on Postbacks
ddlReport.ClearSelection();
ddlReport.Items.FindByText(dt.Rows[i]["Column1"].ToString()).Selected = true;
ddl_TimeFrame.ClearSelection();
ddl_TimeFrame.Items.FindByText(dt.Rows[i]["Column2"].ToString()).Selected = true;
ddl_Attachement.ClearSelection();
ddl_Attachement.Items.FindByText(dt.Rows[i]["Column3"].ToString()).Selected = true;
ddlTemplate.ClearSelection();
ddlTemplate.Items.FindByText(dt.Rows[i]["Column4"].ToString()).Selected = true;
}
rowIndex++;
}
}
}
}
protected void ButtonAdd_Click(object sender, EventArgs e)
{
AddNewRowToGrid();
}
protected void MailGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddlTemplate = (DropDownList)e.Row.FindControl("ddlTemplate");
DropDownList ddlReport = (DropDownList)e.Row.FindControl("ddlReport");
//DropDownList ddlTemplate = (DropDownList)MailGrid.Rows[0].Cells[6].FindControl("ddlTemplate");
//DropDownList ddlReport = (DropDownList)MailGrid.Rows[0].Cells[3].FindControl("ddlReport");
//ListItem Ci = new ListItem("Select", "0");
// ddlgdCategory.Items.Insert(0, Ci);
TrObj.FillDropDown(ddlReport, ((DataSet)ObjAdmin.getAdmin("Mail_Report", "")).Tables[0], "MenuName", "MenuId");
TrObj.FillDropDown(ddlTemplate, ((DataSet)ObjAdmin.Fill_Template("", "")).Tables[0], "TemplateName", "TemplateId");
//ds = ObjAdmin.Fill_Template(opt, TemplateId);
//if (ds.Tables[0].Rows.Count > 0)
//{
// ddlTemplate.DataTextField = "TemplateName";
// ddlTemplate.DataValueField = "TemplateId";
// ddlTemplate.DataSource = ds;
// ddlTemplate.DataBind();
}
}
}
------------
here i have added dropdownllist but page is postback every time
ho i will avoid page postback after aading dropdownlist
plz help me