Backup SQL Server 2008 database to a sql file(like .sql) using c#

You can take the database backup using SQL Server backup wizard or using SQL Server BackUp Database statement

SQL Server Management Objects (SMO) is a collection of objects that are designed for programming all aspects of managing Microsoft SQL Server.

For taking the database backup using C#, you have to add the following references in your application-

Microsoft.SqlServer.ConnectionInfo
Microsoft.SqlServer.Management.Sdk.Sfc
Microsoft.SqlServer.Smo
Microsoft.SqlServer.SmoExtended
Microsoft.SqlServer.SqlEnum

In your .CS file you will have to use the following namespaces-

using Microsoft.SqlServer.Management.Smo;
using Microsoft.SqlServer.Management.Common;

After using above namespaces, write the following code to take the database backup-

public void BackupDatabase(string databaseName, string userName, string password, string serverName, string destinationPath)
    {
        //Define a Backup object variable.
        Backup sqlBackup = new Backup();

        //Specify the type of backup, the description, the name, and the database to be backed up.
        sqlBackup.Action = BackupActionType.Database;
        sqlBackup.BackupSetDescription = "BackUp of:" + databaseName + "on" + DateTime.Now.ToShortDateString();
        sqlBackup.BackupSetName = "FullBackUp";
        sqlBackup.Database = databaseName;

        //Declare a BackupDeviceItem
        BackupDeviceItem deviceItem = new BackupDeviceItem(destinationPath + "FullBackUp.bak", DeviceType.File);
        //Define Server connection
        ServerConnection connection = new ServerConnection(serverName, userName, password);
        //To Avoid TimeOut Exception
        Server sqlServer = new Server(connection);
        sqlServer.ConnectionContext.StatementTimeout = 60 * 60;
        Database db = sqlServer.Databases[databaseName];

        sqlBackup.Initialize = true;
        sqlBackup.Checksum = true;
        sqlBackup.ContinueAfterError = true;

        //Add the device to the Backup object.
        sqlBackup.Devices.Add(deviceItem);
        //Set the Incremental property to False to specify that this is a full database backup.
        sqlBackup.Incremental = false;

        sqlBackup.ExpirationDate = DateTime.Now.AddDays(3);
        //Specify that the log must be truncated after the backup is complete.
        sqlBackup.LogTruncation = BackupTruncateLogType.Truncate;

        sqlBackup.FormatMedia = false;
        //Run SqlBackup to perform the full database backup on the instance of SQL Server.
        sqlBackup.SqlBackup(sqlServer);
        //Remove the backup device from the Backup object.
        sqlBackup.Devices.Remove(deviceItem);
    }

Use SQL Server's Generate Scripts commend

right click on the database; Tasks -> Generate Scripts

1. select your tables, click Next
2. click the Advanced button
3. find Types of data to script - choose Schema and Data.
4. you can then choose to save to file, or put in new query window.
5. results in CREATE and INSERT statements for all table data selected in bullet 2.

try this

 try
                {
                StringBuilder resultScript = new StringBuilder(string.Empty);
                StringBuilder resultScript1 = new StringBuilder(string.Empty);
                var connStr = @"Data Source=.;Initial Catalog=MatrixEPOS;Integrated Security=True";
                var tables = new[] { "tblProductName", "tblProductSize", "tblProductType", "tblcheck", "tblcheckdetails", "tblSubProduct", "tblMeals", "tblMealDetails",
                "tblMealSizes","tblToppings","tblToppings1","tblToppingsSize","tblDressingSize"};
                ScriptingOptions scriptOptions = new ScriptingOptions();
                Server srv1 = new Server(".");
                Database db1 = srv1.Databases["MatrixEPOS"];
                StringBuilder sb = new StringBuilder();
                Urn[] ur;
                resultScript.AppendLine("Use MatrixEPOS");
                resultScript.AppendLine("GO");
                for(int i = 0; i < tables.Length; i++)
                    {

                    //  Table tbl = db1.Tables[tables[i]];
                    Scripter scr = new Scripter(srv1);

                    foreach(Table table in db1.Tables)
                        {
                        if(table.Name == tables[i].ToString())
                            {
                            // Only include lookup tables
                            if(table.ForeignKeys.Count == 0)
                                {
                                ScriptingOptions options = new ScriptingOptions();
                                options.DriAll = false;
                                options.ScriptSchema = false;
                                options.ScriptData = true;
                                scr.Options = options;

                                // Add script to file content 
                                foreach(string scriptLine in scr.EnumScript(new Urn[] { table.Urn }))
                                    {
                                    string line = scriptLine;
                                    line = line.Replace("SET ANSI_NULLS ON", string.Empty);
                                    line = line.Replace("SET QUOTED_IDENTIFIER ON", string.Empty);
                                    line = line.Replace("SET ANSI_NULLS OFF", string.Empty);
                                    line = line.Replace("SET QUOTED_IDENTIFIER OFF", string.Empty);
                                    resultScript.AppendLine(line.Trim());
                                    }
                                //resultScript1.AppendLine(table.Name);
                                //ur = table.Urn;
                                }
                            }
                        else { }
                        }
                    }
                string name12 = resultScript1 + ".sql";
                string fileName = string.Format("{0}.sql", "abc");
                File.WriteAllText(Path.Combine("G:\\", fileName), resultScript.ToString());
                }
            catch(Exception err)
                {
                Console.WriteLine(err.Message);
                }

i was wasting my 2 days on this hope its helpfull for u

and important thing don't forgot to add reference

using Microsoft.SqlServer.Management.Common;
using Microsoft.SqlServer.Management.Sdk.Sfc;
using Microsoft.SqlServer.Management.Smo;