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  How to DataAdapter in Sql Server

SqlDataAdapter provides the communication between the Dataset and the Data Source with the help of SqlConnection Object . The SqlConnection Object has no information about the data it retrieves . Similarly a Dataset has no knowledge of the Data Source where the data coming from. So the SqlDataAdapter manage the communication between these two Objects.

A DataAdapter is used to retrieve data from a data source and populate tables within a DataSet. The DataAdapter also resolves changes made to the DataSet back to the data source. We can use Fill method of the SqlDataAdapter for populating data in a Dataset. The following c# source code shows a simple program that uses SqlDataAdapter to retrieve data from Data Source with the help of SqlConnection Object and populate the data in a Dataset .

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C# Tutorial

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string connetionString = null; 
            SqlConnection connection ; 
            SqlDataAdapter adapter ; 
            DataSet ds = new DataSet(); 
            int i = 0;
            connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password"; 
            connection = new SqlConnection(connetionString); 
            try { 
                connection.Open();
                adapter = new SqlDataAdapter("Your SQL Statement Here", connection); 
                adapter.Fill(ds); 
                connection.Close(); 
                for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++) { 
                    MessageBox.Show (ds.Tables[0].Rows[i].ItemArray[1].ToString()); 
                } 
            } 
            catch (Exception ex) { 
                MessageBox.Show(ex.ToString()); 
            } 
        }
    }
}



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