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ADO.NET

ADO.NET DataView in ASP.NET


A DataView provides various views of the data stored in a DataTable. Using a DataView, you can expose the data in a table with different sort orders, and you can filter the data by row state or based on a filter expression. That is we can customize the views of data from a DataTable.

Creating Table in SQL Server Database

Now create a table named UserDetail with the columns UserID and UserName. The table looks like as below.

image.gif

Now insert some data into the table.

Now creating a new web application project in Visual Studio 2010. Now add the following namespace.

using System.Data.SqlClient;

using System.Data;

 

Now write the connection string to connect to the database.

 

string strConnection = "Data Source=.; uid=sa; pwd=wintellect;database=Rohatash;";

 

Here in aspx code, I used a DataGrid.

 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication120.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>  

        <asp:GridView ID="GridView1" runat="server">

        </asp:GridView>   

    </div>

    </form>

</body>

</html>

 

Now we create a simple application showing the SQL Server Table Data in the GridView. The following code is the simple code without using DataView.

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.SqlClient;

using System.Data;

 

namespace WebApplication120

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            show();

        }

        private void show()

        {

            {

                SqlConnection con = new SqlConnection("Data Source=.; uid=sa; pwd=wintellect;database=Rohatash;");

                string strSQL = "Select * from UserDetail";

                SqlDataAdapter dt = new SqlDataAdapter(strSQL, con);

                DataSet ds = new DataSet();

                dt.Fill(ds, "UserDetail");

                con.Close();

                GridView1.DataSource = ds;

                GridView1.DataBind();

            }

        }

    }

}

 

Creating a DataView

 

To convert a DataSet to a DataView in ASP.Net using C# code, you can initialize the DataView class object by accessing the DefaultView property via DataTable collection of DataSet. DefaultView property enables you to convert the DataSet to DataView.

 

SqlConnection con = new SqlConnection("Data Source=.; uid=sa; pwd=wintellect;database=Rohatash;");

                string strSQL = "Select * from UserDetail";

                SqlDataAdapter dt = new SqlDataAdapter(strSQL, con);

                DataSet ds = new DataSet();

                dt.Fill(ds, "UserDetail");

                con.Close();

                DataView dv = new DataView();               

                GridView1.DataSource = ds.Tables[0].DefaultView;

                GridView1.DataBind();

 

Now run the application.

 

image1.gif

Adding new row in the DataView

 

We can add new rows in the DataView using AddNew() method in the DataView. The following C# source code shows how to add a new row in a DataView.

 

SqlConnection con = new SqlConnection("Data Source=.; uid=sa; pwd=wintellect;database=Rohatash;");

                string strSQL = "Select * from UserDetail";

                SqlDataAdapter dt = new SqlDataAdapter(strSQL, con);

                DataSet ds = new DataSet();

                dt.Fill(ds, "UserDetail");

                con.Close();

                DataView dv = new DataView(ds.Tables[0]);

                DataRowView newrow = dv.AddNew();

                newrow["UserID"] = 7;

                newrow["UserName"] = "ram";

                newrow.EndEdit();

                GridView1.DataSource = dv;

                GridView1.DataBind();

 

Now run the application. we will see row has been added in the DataView.

 

image2.gif

Delete rows in a DataView

We can add new rows in the DataView using Delete() method in the DataView. The following C# source code shows how to delete rows in a DataView.

SqlConnection con = new SqlConnection("Data Source=.; uid=sa; pwd=wintellect;database=Rohatash;");

                string strSQL = "Select * from UserDetail";

                SqlDataAdapter dt = new SqlDataAdapter(strSQL, con);

                DataSet ds = new DataSet();

                dt.Fill(ds, "UserDetail");

                con.Close();

                DataView dv = new DataView(ds.Tables[0],"", "UserID", DataViewRowState .CurrentRows);

                dv.Table.Rows[4].Delete();

                GridView1.DataSource = dv;

                GridView1.DataBind();

 

Now run the application.

 

image3.gif


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