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*********************************************************** ****************** Title: How to prevent a Windows program from being activated multiple sources: http://community.9cbs.net/expert/topic/2945/2945464. XML? Temp = .7424738 ******************************************************* ************************ You can use the mutex Mutex type to complete this feature. See the following code: [stathread] public static void main (string [] args) {// declares the mutex. Mutex Mutex = New Mutex (False, "ThisSholdonlyRunon"); // Judging whether the mutex is used. Bool running =! Mutex.waitone (0, false); if (! Running) Application.run (New Formlogin ()); Else MessageBox.show ("Application has started!");}

*********************************************************** ******************* Title: Operation text Source: http://community.9cbs.net/expert/topic/3122/3122376.xml? Temp = 1.827419E- 03 ********************************************************** ******************* // read text file filename.text = filename; filestream fs = new filestream (server.mappath (") " // " filename, filemode.open, fileaccess.read); // Use the default encoding to read the contents of the Open file StreamReader SR = New StreamReader (FS, Encoding.default); stringbuilder output = new stringbuilder (); string rl; While ((rl = sr.readline ())! = null) {Output.Append (rl); output.append ("/ n");} sr.close (); fs.close (); filet.Text = Output;

//save document

FILESTREAM FW = New FileStream (FilePath FileName, FileMode.create, FileAccess.write); // Establishing streamWrite to prepare for writing

StreamWriter rw = new streamwriter (fw, encoding.default); rw.write (filetxt.text.tostring ()); rw.close (); fw.close ();

Use the above code to read the data, you can save it after you change. *********************************************************** ******************* Title: How to get a table's structure Source: http://community.9cbs.net/expert/topic / 3163/3163386.xml?temp=9.685916e-02**************************************************** ******************************** ///