First push

src/Ajax/MySite.Web/Grid.aspx.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Data;
+using System.Web.UI.WebControls;
+using Telerik.Web.UI;
+
+namespace MySite.Web
+{
+    public partial class Grid : System.Web.UI.Page
+    {
+        public DataTable Sellers
+        {
+            get
+            {
+                DataTable data = Session["Data"] as DataTable;
+
+                if (data == null)
+                {
+                    data = GetSellers();
+                    Session["Data"] = data;
+                }
+
+                return data;
+            }
+        }
+
+        public DataTable GetSellers()
+        {
+            DataTable data = new DataTable();
+            data.Columns.Add("ID", typeof(int));
+            data.Columns.Add("Name");
+            data.Columns.Add("Age", typeof(int)).DefaultValue = 0;
+            data.Columns.Add("BirthDate", typeof(DateTime));
+            data.Columns.Add("Rating", typeof(int)).DefaultValue = 0;
+            data.Columns.Add("City");
+            data.PrimaryKey = new DataColumn[] { data.Columns["ID"] };
+
+            List<string> firstNames = new List<string>() { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Nige" };
+            List<string> cities = this.GetCities();
+            List<DateTime> birthDates = new List<DateTime>() { DateTime.Parse("1948/12/08"), DateTime.Parse("1952/02/19"), DateTime.Parse("1963/08/30"), DateTime.Parse("1937/09/19"), DateTime.Parse("1955/03/04"), DateTime.Parse("1963/07/02"), DateTime.Parse("1960/05/29"), DateTime.Parse("1958/01/09"), DateTime.Parse("1966/01/27"), DateTime.Parse("1966/03/27") };
+            Random random = new Random();
+
+            for (int i = 0; i < 84; i++)
+            {
+                DateTime birthDate = birthDates[random.Next(birthDates.Count - 1)];
+                data.Rows.Add(
+                    random.Next(10000, int.MaxValue),
+                    firstNames[random.Next(firstNames.Count - 1)],
+                    DateTime.Now.Year - birthDate.Year, birthDate, random.Next(1, 5),
+                    cities[random.Next(cities.Count - 1)]);
+            }
+
+            return data;
+        }
+
+        public List<string> GetCities()
+        {
+            return new List<string>()
+        {
+            "Seattle",
+            "Tacoma",
+            "Kirkland",
+            "Redmond",
+            "London",
+            "Philadelphia",
+            "New York",
+            "Seattle",
+            "London",
+            "Boston"
+        };
+        }
+
+        protected void RadGrid1_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
+        {
+            RadGrid1.DataSource = this.Sellers;
+        }
+
+        protected void RadGrid1_UpdateCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)
+        {
+            Hashtable table = new Hashtable();
+            (e.Item as GridEditableItem).ExtractValues(table);
+
+            DataRow row = this.Sellers.Rows.Find((e.Item as GridEditableItem).GetDataKeyValue("ID"));
+
+            foreach (string key in table.Keys)
+            {
+                row[key] = table[key] ?? DBNull.Value;
+            }
+            DateTime date;
+            if (DateTime.TryParse((row["BirthDate"].ToString()), out date))
+            {
+                row["Age"] = DateTime.Now.Year - date.Year;
+            }
+            else
+            {
+                row["Age"] = 0;
+            }
+        }
+
+        protected void RadGrid1_InsertCommand(object sender, GridCommandEventArgs e)
+        {
+            Hashtable table = new Hashtable();
+            (e.Item as GridEditableItem).ExtractValues(table);
+            DataRow row = this.Sellers.NewRow();
+
+            foreach (string key in table.Keys)
+            {
+                if (table[key] != null)
+                {
+                    row[key] = table[key];
+                }
+            }
+            row["ID"] = new Random().Next(int.MaxValue);
+            DateTime date;
+            if (DateTime.TryParse((row["BirthDate"].ToString()), out date))
+            {
+                row["Age"] = DateTime.Now.Date.Year - date.Year;
+            }
+            this.Sellers.Rows.InsertAt(row, 0);
+        }
+
+        protected void RadGrid1_DeleteCommand(object sender, GridCommandEventArgs e)
+        {
+            this.Sellers.Rows.Remove(this.Sellers.Rows.Find((e.Item as GridEditableItem).GetDataKeyValue("ID")));
+        }
+
+        protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
+        {
+            RadComboBox comboBox = e.Item.FindControl("RCB_City") as RadComboBox;
+            if (comboBox != null)
+            {
+                if (!(e.Item.DataItem is GridInsertionObject))
+                {
+                    comboBox.SelectedValue = (e.Item.DataItem as DataRowView)["City"].ToString();
+                }
+                comboBox.DataTextField = string.Empty;
+                comboBox.DataSource = this.GetCities();
+                comboBox.DataBind();
+                if (this.RadGrid1.ResolvedRenderMode == RenderMode.Mobile)
+                {
+                    (e.Item.FindControl("TB_Age") as WebControl).Enabled = false;
+                }
+                else
+                {
+                    ((e.Item as GridEditableItem)["Age"].Controls[0] as WebControl).Enabled = false;
+                }
+            }
+        }
+
+        protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e)
+        {
+            GridHeaderItem headerItem = e.Item as GridHeaderItem;
+            if (headerItem != null)
+            {
+                headerItem["EditColumn"].Text = string.Empty;
+                headerItem["DeleteColumn"].Text = string.Empty;
+            }
+        }
+    }
+}