Creating SQL Server Backup File With C#

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 == "backup")
                {
                    SaveFileDialog1.FileName = ComboBoxDatabaseName.Text;
                    SaveFileDialog1.ShowDialog();                                     
                    string s = null;
                    s = SaveFileDialog1.FileName;
                    query("Backup database " + ComboBoxDatabaseName.Text + " to disk='" + s + "'");
                    label3.Visible = true;
                    label3.Text = "Database BackUp has been created successful";
                }
            }
        }
        private void cmbbackup_Click(object sender, EventArgs e)
        {
            blank("backup");          
        }
        private void cmbserver_SelectedIndexChanged(object sender, EventArgs e)
        {
            Createconnection();
        }
    }
}

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 create the backup.

Now click on the "Backup" Button and select the backup location.

Now open the selected location to see the backup file.