how to use gridview in asp.net c#

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 simple telerick grid and dispaly the database table values usinpg c# .net  
 ---------------------------------------------------------------------------------------------------------------  
 simple 3 steps:  
 1)btnSave_Click                 'button click  
 2)GetDataTable(parameter is query here) ' calling function from grid   
 3)DataTable GetDataTable(string query)  ' defination of above function  
 or if you want to show the table separtely write code in view button.  
 step 1):  
 -------  
 using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Web;  
 using System.Web.UI;  
 using System.Web.UI.WebControls;  
 using System.Configuration;  
 using System.Data.SqlClient;  
 using System.Data;  
 namespace myFirstOfficeDemo  
 {  
   public partial class alert : System.Web.UI.Page  
   {  
     protected void Page_Load(object sender, EventArgs e)  
     {  
     }  
     protected void btnSave_Click(object sender, EventArgs e)  
     {  
       string str = "Data Source=.;Initial Catalog=alertDb;Integrated Security=True";  
       SqlConnection con = new SqlConnection(str);  
       con.Open();  
       SqlCommand com = new SqlCommand("SP_ADD_ALERT", con);  
       com.Parameters.Add("@header", SqlDbType.VarChar).Value = txtHeader.Text;  
       com.Parameters.Add("@text", SqlDbType.VarChar).Value = txtText.Text;  
       com.CommandType = CommandType.StoredProcedure;  
       com.ExecuteNonQuery();  
       string script = "alert('Saved');";  
       ClientScript.RegisterClientScriptBlock(this.GetType(), "Alert", script, true);  
       con.Close();  
       txtHeader.Text = "";  
       txtText.Text = "";  
     }  
     'protected void btnView_Click(object sender, EventArgs e)  
     '{  
     '    
     '}  
 step 2):  
 -------  
     public void RadGrid1_NeedDataSource1(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)  
     {  
       RadGrid1.DataSource = GetDataTable("SELECT alertId, header, text FROM utilAlert");  
     }  
 step 3):  
 -------  
     public DataTable GetDataTable(string query)  
     {  
       String ConnString = ConfigurationManager.ConnectionStrings["alertDbConnectionString"].ConnectionString;  
       SqlDataAdapter adapter = new SqlDataAdapter();  
       DataTable myDataTable = new DataTable();  
       using (SqlConnection conn = new SqlConnection(ConnString))  
       {  
         adapter.SelectCommand = new SqlCommand(query, conn);  
         adapter.Fill(myDataTable);  
       }  
       return myDataTable;  
     }  
   }  
 }  

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