DbUtility

public static void BackupSQLServerDB(string connectionString, string backupPath)
        {
using (SqlConnection conn = new SqlConnection(connectionString))
            {
//string sql = "use master;backup database " + conn.Database + " to disk='" + backupPath + "'";
                string sql = "use master;backup database " + conn.Database + " to disk='" + backupPath + "' with init;";
using (SqlCommand cmd = new SqlCommand(sql, conn))
                {
                    cmd.CommandTimeout = 0;
                    conn.Open();
                    cmd.ExecuteNonQuery();
                }
            }
        }
public static void RestoreSQLServerDB(string connectionString, string backupPath)
        {
using (SqlConnection spConn = new SqlConnection(connectionString))
            {
                SqlCommand spCmd = new SqlCommand("use master;SELECT spid FROM sysprocesses,sysdatabases WHERE sysprocesses.dbid=sysdatabases.dbid AND sysdatabases.name='" + spConn.Database + "'", spConn);
                spConn.Open();
//KILL DataBase Process
                List<short> spList = new List<short>();
                SqlDataReader dr = spCmd.ExecuteReader();
while (dr.Read())
                {
                    spList.Add(dr.GetInt16(0));
                }
                dr.Close();
for (int i = 0; i < spList.Count; i++)
                {
                    spCmd = new SqlCommand(string.Format("KILL {0}", spList[i]), spConn);
                    spCmd.ExecuteNonQuery();
                }
using (SqlConnection conn = new SqlConnection(connectionString))
                {
//string sql = "use master;restore database " + conn.Database + " From disk='" + backupPath + "'";
                    string sql = "use master;restore database " + conn.Database + " From disk = '" + backupPath + "' with replace;";
using (SqlCommand cmd = new SqlCommand(sql, conn))
                    {
                        cmd.CommandTimeout = 0;
                        conn.Open();
                        cmd.ExecuteNonQuery();
                    }
                }
            }
        }

    /// <summary>
    /// make sure there's no open connections to your db before calling this method!
    /// </summary>
    /// <param name="tempDBPath">临时文件路径</param>
    /// <param name="connectionString">connection string to your db</param>
    /// <param name="mdwfilename">FULL name of an MDB file you want to compress.</param>
    public static void CompactOfficeAccessDB(string tempDBPath, string connectionString, string mdwfilename)
    {
        //create an inctance of a Jet Replication Object
        object objJRO = Activator.CreateInstance(Type.GetTypeFromProgID("JRO.JetEngine"));

        //filling Parameters array
        //cnahge "Jet OLEDB:Engine Type=5" to an appropriate value or leave it as is if you db is JET4X format (access 2000,2002)
        //(yes, jetengine5 is for JET4X, no misprint here)
        object[] oParams = new object[] { connectionString, "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + tempDBPath + ";Jet OLEDB:Engine Type=5" };

        //invoke a CompactDatabase method of a JRO object
        //pass Parameters array
        objJRO.GetType().InvokeMember("CompactDatabase", System.Reflection.BindingFlags.InvokeMethod, null, objJRO, oParams);

        //database is compacted now to a new file tempDBPath
        //let's copy it over an old one and delete it
        System.IO.File.Delete(mdwfilename);
        System.IO.File.Move(tempDBPath, mdwfilename);

        //clean up (just in case)
        System.Runtime.InteropServices.Marshal.ReleaseComObject(objJRO);
        objJRO = null;
    }