Show Temporary Data in RadGrid

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  Show Temporary Data in RadGrid

Write below code in aspx page

  <div>
            <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>

            <telerik:RadGrid ID="RadGrid1" runat="server" Width="70%" ShowFooter="True" MasterTableView-NoDetailRecordsText="" MasterTableView-NoMasterRecordsText="" AutoGenerateColumns="false" ShowHeader="False" OnItemCommand="RadGrid1_ItemCommand">
                <MasterTableView NoDetailRecordsText="" NoMasterRecordsText="">

                    <Columns>
                        <telerik:GridTemplateColumn Display="false">
                            <ItemTemplate>
                                <telerik:RadLabel ID="lblid" runat="server" Text='<%# Bind("Level_Id") %>'></telerik:RadLabel>
                            </ItemTemplate>
                        </telerik:GridTemplateColumn>
                        <telerik:GridTemplateColumn>
                            <ItemTemplate>
                                <telerik:RadLabel ID="lbllevel1" runat="server" Text='<%# Bind("LevelName") %>'></telerik:RadLabel>
                            </ItemTemplate>
                            <FooterTemplate>
                                <telerik:RadTextBox ID="txtlevel2" runat="server" MaxLength="10"></telerik:RadTextBox>
                            </FooterTemplate>
                        </telerik:GridTemplateColumn>
                        <telerik:GridTemplateColumn>
                         
                            <FooterTemplate>
                                <telerik:RadButton ID="btnadd" CommandName="add_level" runat="server" Text="+add" CausesValidation="false" ValidationGroup="level"></telerik:RadButton>
                            </FooterTemplate>
                        </telerik:GridTemplateColumn>
                    </Columns>
                </MasterTableView>
            </telerik:RadGrid>


        </div>

Write the below code in aspx.cs page

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Telerik.Web.UI;

namespace Cascading_Dropdown_
{
    public partial class RadGrid : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if(!IsPostBack)
            {
                table();

            }
        }
        protected void table()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("Level_Id", typeof(string));
            dt.Columns.Add("LevelName", typeof(string));
            Session["dt"] = dt;
            BindGrid();
        }
        protected void BindGrid()
        {
           
            DataTable dt = (Session["dt"]) as DataTable;
            List<MyType> list = new List<MyType>();
            var lst = (from DataRow dr in dt.Rows
                       select new MyType()
                       {
                           Level_Id = dr["Level_Id"].ToString(),
                           
                           LevelName=dr["LevelName"].ToString()
                       }).ToList();
            Session["d"] = lst;
            RadGrid1.DataSource = Session["d"];
            RadGrid1.DataBind();
        }
        protected void RadGrid1_ItemCommand(object sender,Telerik.Web.UI.GridCommandEventArgs e)
        {
            if(e.CommandName=="add_level")
            {

                GridFooterItem footeritem=(GridFooterItem)e.Item;
                if(((RadTextBox)footeritem.FindControl("txtlevel2")).Text!="")
                {
                    DataTable dt = (Session["dt"] as DataTable);
                    DataRow dr = dt.NewRow();
                    dr["Level_Id"] = "";
                    dr["LevelName"] = ((RadTextBox)footeritem.FindControl("txtlevel2")).Text;
                    dt.Rows.Add(dr);
                    Session["dt"] = dt;
                    BindGrid();
                }
                else
                {

                }
              
            }
        }
    }
}

Add a webform (.cs file) and write the below code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Cascading_Dropdown_
{
    public class MyType
    {
        public string LevelName { get; set; }
        public string Level_Id { get; set; }
    }
}

Output



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