C # Write a TXT file

Using  System. IO;  Using  System. diagnostics;  Namespace  Webapplication1 {  Public   Class  Filetext {  Public   Static   String Fileaddress = "  C: \ error.txt  "  ; ///   <Summary>          ///  Record the wrong class name and method name and error message  ///   </Summary>          ///   <Param name = "classname">  Error Class Name  </Param>          ///   <Param name = "ex">  Error instance  </Param>          Public   Static  Void  Record (exception ex ){  Try  {Filestream FS = Null  ;  If (! File. exists (fileaddress) {FS = New  Filestream (fileaddress, filemode. Create );}  Else  {FS =New  Filestream (fileaddress, filemode. append);} stacktrace St = New Stacktrace ( True  );  String Transfermethod = ST. getframe ( 1  ). Getmethod (). Name. tostring (); streamwriter SW = New  Streamwriter (FS); Sw. writeline (  "  ------------------------------ "  ); Sw. writeline (  "  Date:  " + Datetime. Now. tostring ( "  G  "  ); Sw. writeline (  "  Method for calling error records:  " + Transfermethod); Sw. writeline (  "  Method for triggering the error: " + Ex. targetsite. tostring (); Sw. writeline (  "  Error message:  " + Ex. Message. tostring (); Sw. writeline (  "  ------------------------------  "  ); Sw. Close ();}  Catch  (Ioexception IOE ){}}  Public  Static   Void Writestring ( String  Str) {filestream FS = Null  ;  If (! File. exists (fileaddress) {FS = New  Filestream (fileaddress, filemode. Create );}  Else  {FS = New Filestream (fileaddress, filemode. append);} stacktrace St = New Stacktrace ( True  );  String Transfermethod = ST. getframe ( 1  ). Getmethod (). Name. tostring (); streamwriter SW = New  Streamwriter (FS); Sw. writeline (  "  ------------------------------  " ); Sw. writeline (  "  Date:  " + Datetime. Now. tostring ( "  G  "  ); Sw. writeline (  "  Error message:  " + Str); Sw. writeline (  "  ------------------------------  " ); Sw. Close ();}}}