how to Repeater update only when table rows updated in sql using SqlCacheDependency in ASP.Net?

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Advantage-repeater/Gridview/Datalist do not load every time from database ,it load when any change or add in database .

In this article, we are going to learn how to implement SQL Caching in ASP.NET using Poll based SQL Cache dependency

SQL Cache dependency helps to cache tables in ASP.NET application in memory. So rather than making SQL server trips we can fetch the data from the cached object from ASP.NET.

Step- 1
ALTER DATABASE MyDatabase SET ENABLE_BROKER
Step- 2 
aspx Page

<asp:Repeater ID="RepDetails" runat="server">
    <ItemTemplate>
        <asp:Label ID="lblid" runat="server" Text='<%#Eval("Cat_Id") %>' Font-Bold="true"
            Visible="false" />
        <asp:LinkButton ID="LinkButton1" runat="server" Text='<%#Eval("Cat_Name") %>' ForeColor="Green"></asp:LinkButton>
    </ItemTemplate>
</asp:Repeater>
Step- 3 
Add Namespace

using System.Configuration;
using System.Web;
using System.Web.Caching;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;
using NUnit.Framework;
Step-4

C# code

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataSet myCustomers;
        myCustomers = (DataSet)Cache["firmCustomers"];
        if (myCustomers == null)
        {
            string CS = ConfigurationManager.ConnectionStrings["ErpConnection"].ConnectionString;
            SqlConnection conn = new SqlConnection(CS);
            SqlDataAdapter da = new SqlDataAdapter("Select top(30) * from tbl_Category", conn);
            System.Web.Caching.SqlCacheDependencyAdmin.EnableNotifications(CS);
            System.Web.Caching.SqlCacheDependencyAdmin.EnableTableForNotifications(CS, "tbl_Category");
            myCustomers = new DataSet();
            da.Fill(myCustomers);
            SqlCacheDependency myDependency = new SqlCacheDependency("Databasename", "tbl_Category");
            Cache.Insert("firmCustomers", myCustomers, myDependency);
            Label1.Text = "Produced from database.";
        }
        else
        {
            Label1.Text = "Produced from Cache object.";
        }
        RepDetails.DataSource = myCustomers;
        RepDetails.DataBind();
        {
            // BindGrid(null);
        }
    }
}
private static DataTable GetData(string query)
{
    string str = ConfigurationManager.ConnectionStrings["ErpConnection"].ConnectionString;
    using (SqlConnection connection = new SqlConnection(str))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = query;
            using (SqlDataAdapter adr = new SqlDataAdapter())
            {
                cmd.Connection = connection 
                adr.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    return dt;
                }
            }
        }
    }
}
Step -5 
 modify in web.config

<connectionStrings>
  <add name="ErpConnection" connectionString="Data Source=MYPC\SQLEXPRESS;Initial Catalog=Databasename;integrated security=true" providerName="System.Data.SqlClient"/>
</connectionStrings>
add this code within <system.web>

<system.web>
  <caching>
    <sqlCacheDependency enabled="true"  pollTime = "500000">
      <databases>
        <add name="Databasename" connectionStringName="ErpConnection" pollTime="500000"/>
      </databases>
    </sqlCacheDependency>
  </caching>
</system.web>

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