Generate database Backup script using C# and VB.Net in ASP.Net

Hi all

How to write script for backup database same as structure

I have a web app provide to multi customers. In database every customer has one id (id_customer).

example:

table1(colum1, colum2, clomum3.....,id_customer )

table2(colum1, colum2, clomum3.....,id_customer )

...

tableN(colum1, colum2, clomum3.....,id_customer )

Now, I want: when customer login to system (with His id_customer), he can only backup his database.

In win form I success done by using SMO, code:

        public void BackuptDataBase(string login_user, string fileSQL)
        {
            con = new SqlConnection(constr);
            string dataBaseName = con.Database.ToString();
            Microsoft.SqlServer.Management.Common.ServerConnection serverConnection = new Microsoft.SqlServer.Management.Common.ServerConnection(con);
            Microsoft.SqlServer.Management.Smo.Server server = new Microsoft.SqlServer.Management.Smo.Server(serverConnection);
            Microsoft.SqlServer.Management.Smo.Database database = server.Databases["" + dataBaseName + ""];

            if (database != null)
            {
                Microsoft.SqlServer.Management.Smo.Scripter scripter = new Microsoft.SqlServer.Management.Smo.Scripter(server);
                scripter.Options.ScriptData = true;
                string Drop_OR_DeleteTable, filename;
                string folder = System.Web.HttpContext.Current.Server.MapPath("~/");

                if (login_user == "admin")
                {
                    scripter.Options.ScriptSchema = true;
                    Drop_OR_DeleteTable = "DROP TABLE ";
                }
                else
                {
                    scripter.Options.ScriptSchema = false;
                    Drop_OR_DeleteTable = "Delete From ";
                }

                filename = folder + fileSQL;
                scripter.Options.ScriptDrops = false;
                var sb = new System.Text.StringBuilder();

                foreach (Microsoft.SqlServer.Management.Smo.Table table in database.Tables)
                {  
                        sb.Append(Drop_OR_DeleteTable + table.Name);
                        sb.Append(Environment.NewLine);
                      
                        foreach (string s in scripter.EnumScript(new Microsoft.SqlServer.Management.Sdk.Sfc.Urn[] { table.Urn }))
                        {                            
                                sb.Append(s);
                                sb.Append(Environment.NewLine);
                            
                        } 

                    System.IO.StreamWriter fs = System.IO.File.CreateText(filename);
                    fs.Write(sb);
                    fs.Close();                    
                }
            }
        }

please help me script by ASP.net C#.