Restore SQL Server Backup File With C#

In this article, I would like to show how to restore a SQL Server Backup file in C#. In my previous article, I defined how to create a SQL Server Backup File with C#. 

http://www.c-sharpcorner.com/UploadFile/rohatash/creating-sql-server-backup-file-with-C-Sharp/

You can also restore a SQL Server database backup file using SQL Server Management Studio and you can also use a Transact-SQL statement. We use a backup database and restore the database when our database becomes corrupted or crashes.

To do it using SQL Server management Studio:

http://www.c-sharpcorner.com/UploadFile/898089/how-to-restore-database-backup-in-sql-server-2012/

So let's have a look at a practical example of how to restore a backup file using C#. The example is developed in Visual Studio 2010. 

In SQL Server

The following query gives the name of the database and the server name:

Select *  from sysservers  where srvproduct='SQL Server'

go

Select * from sysdatabases

Output

If you want to restore a database from a backup file, just execute the following query in SQL Server Management Studio.

IF EXISTS (SELECT name FROM master.dbo.sysdatabases WHERE name = 'test')

DROP DATABASE test RESTORE DATABASE test FROM DISK = 'E:/test.bak' 

The backup of the student database has been created on the given location.

Output

In Visual Studio 2010,

The SQL Server query above returns the server name and all database names. Now execute it using C# code. To do that create a Windows Forms application and drag and drop the following control onto the form.

C# code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Data.SqlClient;
namespace SQLBackUpApp
{
    public partial class Form1 : Form
    {
        SqlConnection con;
        SqlCommand cmd;
        SqlDataReader dr;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            label3.Visible = false;
            serverName(".");          
        }
        public void serverName(string str)
        {
            con = new SqlConnection("Data Source=" + str + ";Database=Master;data source=.; uid=sa; pwd=Micr0s0ft;");
            con.Open();
            cmd = new SqlCommand("select *  from sysservers  where srvproduct='SQL Server'", con);
            dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                ComboBoxserverName.Items.Add(dr[2]);
            }
            dr.Close();
        }
        public void Createconnection()
        {
            con = new SqlConnection("Data Source=" + (ComboBoxserverName.Text) + ";Database=Master;data source=.; uid=sa; pwd=Micr0s0ft;");
            con.Open();
            ComboBoxDatabaseName.Items.Clear();
            cmd = new SqlCommand("select * from sysdatabases", con);
            dr = cmd.ExecuteReader();
            while(dr.Read())
            {
                ComboBoxDatabaseName.Items.Add(dr[0]);
            }
            dr.Close();
        }
        public void query(string que)
        {
            // ERROR: Not supported in C#: OnErrorStatement
            cmd = new SqlCommand(que, con);
            cmd.ExecuteNonQuery();
        }
        public void blank(string str)
        {
            if (string.IsNullOrEmpty(ComboBoxserverName.Text) | string.IsNullOrEmpty(ComboBoxDatabaseName.Text))
            {
                // label3.Visible = true;
                MessageBox .Show("Server Name & Database can not be Blank");
                return;
            }
            else
            {                 
               if (str == "restore")
               {
                   OpenFileDialog1.ShowDialog();
                   // string a = ComboBoxDatabaseName.Text.ToString();
                   query("IF EXISTS (SELECT name FROM master.dbo.sysdatabases WHERE name = N'" + ComboBoxDatabaseName.Text + "') DROP DATABASE " + ComboBoxDatabaseName.Text + " RESTORE DATABASE " + ComboBoxDatabaseName.Text + " FROM DISK = '" + OpenFileDialog1.FileName + "'");
                   label3.Visible = true;
                   label3.Text = "Database Backup file has been restore successfully";     
               }
            }
        }
        private void ComboBoxserverName_SelectedIndexChanged(object sender, EventArgs e)
        {
            Createconnection();
        }
        private void cmbrestore_Click(object sender, EventArgs e)
        {
            blank("restore");
        }
    }
}

In the code above you can change the connection string corresponding to your database.

Now run the application and select the server name and database name to restore the database backup file.

Now click on the "Restore" Button and select the backup file location from the disk.

Now open the selected database to see the backup file data.