Sql代码
-- 备份数据库   
backup database db_CSManage to disk="c:\backup.bak"  
-- 还原数据库，必须先备份该数据库的日志文件到原先的备份文件中   
backup log db_CSManage to disk="c:\backup.bak"  
restore database db_CSManage from disk="c:\backup.bak"  
-- 备份数据库
backup database db_CSManage to disk="c:\backup.bak"
-- 还原数据库，必须先备份该数据库的日志文件到原先的备份文件中
backup log db_CSManage to disk="c:\backup.bak"
restore database db_CSManage from disk="c:\backup.bak"

    其中db_CSManage是数据库名称，disk后的路径即是备份文件存储的路径。
知道了SQL语句，那么在.NET代码中就容易多了，备份的.NET代码如下：

C#代码
try  
{   
    if (txtPath.Text != "" && txtName122.Text != "")   
     {   
         getSqlConnection geCon = new getSqlConnection();   
         SqlConnection con = geCon.GetCon();   
  
        string strBacl = "backup database db_CSManage to disk="" + txtPath.Text.Trim() + "\\" + txtName.Text.Trim() + ".bak"";   
         SqlCommand Cmd = new SqlCommand(strBacl, con);   
        if (Cmd.ExecuteNonQuery() != 0)   
         {   
             MessageBox.Show("数据备份成功！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);   
            this.Close();   
         }   
        else  
         {   
             MessageBox.Show("数据备份失败！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);   
         }   
  
     }   
    else  
     {   
         MessageBox.Show("请填写备份的正确位置及文件名！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);   
  
     }// end   
}   
catch (Exception ee)   
{   
     MessageBox.Show(ee.Message.ToString());   
}  
try
{
 if (txtPath.Text != "" && txtName122.Text != "")
 {
  getSqlConnection geCon = new getSqlConnection();
  SqlConnection con = geCon.GetCon();

  string strBacl = "backup database db_CSManage to disk="" + txtPath.Text.Trim() + "\\" + txtName.Text.Trim() + ".bak"";
  SqlCommand Cmd = new SqlCommand(strBacl, con);
  if (Cmd.ExecuteNonQuery() != 0)
  {
   MessageBox.Show("数据备份成功！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
   this.Close();
  }
  else
  {
   MessageBox.Show("数据备份失败！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
  }

 }
 else
 {
  MessageBox.Show("请填写备份的正确位置及文件名！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);

 }// end
}
catch (Exception ee)
{
 MessageBox.Show(ee.Message.ToString());
}

以下是还原数据库的代码，在示例中发现开头得先删除与该数据库相关的进程，然后在还原之前得先把数据库日志备份到开始的备份文件中，然后才还原备份文件，要不然会出错的，代码如下：

C#代码
if (textPaht.Text != "")   
{   
     getSqlConnection geCon = new getSqlConnection();   
     SqlConnection con = geCon.GetCon();   
    if (con.State == ConnectionState.Open)   
     {   
         con.Close();   
     }   
    string DateStr = "Data Source=niunan\\sqlexpress;Database=master;User id=sa;PWD=123456";   
     SqlConnection conn = new SqlConnection(DateStr);   
     conn.Open();   
  
    //-------------------杀掉所有连接 db_CSManage 数据库的进程--------------   
    string strSQL = "select spid from master..sysprocesses where dbid=db_id( "db_CSManage") ";   
     SqlDataAdapter Da = new SqlDataAdapter(strSQL, conn);   
  
     DataTable spidTable = new DataTable();   
     Da.Fill(spidTable);   
  
     SqlCommand Cmd = new SqlCommand();   
     Cmd.CommandType = CommandType.Text;   
     Cmd.Connection = conn;   
  
    for (int iRow = 0; iRow <= spidTable.Rows.Count - 1; iRow++)   
     {   
         Cmd.CommandText = "kill " + spidTable.Rows[iRow][0].ToString();   //强行关闭用户进程   
         Cmd.ExecuteNonQuery();   
     }   
     conn.Close();   
     conn.Dispose();   
    //--------------------------------------------------------------------   
  
     SqlConnection sqlcon = new SqlConnection(DateStr);   
     sqlcon.Open();   
    string sql = "backup log db_CSManage to disk="" + textPaht.Text.Trim() + "" restore database db_CSManage from disk="" + textPaht.Text.Trim() + """;   
     SqlCommand sqlCmd = new SqlCommand(sql, sqlcon);   
     sqlCmd.ExecuteNonQuery();   
     sqlCmd.Dispose();   
     sqlcon.Close();   
     sqlcon.Dispose();   
     MessageBox.Show("数据还原成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);   
     MessageBox.Show("为了必免数据丢失，在数据库还原后将关闭整个系统。");   
     Application.Exit();   
}   
else  
{   
     MessageBox.Show("请选择备份文件！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);   
}