Hi Stefan ,

Thanks for your reply , I  already able to hook the event  with  contril .

But I am facing new problem with XamSyntaxEditor .

I have user Control 'codeEditor' ,which   was previously using RTF  as editor , now we want to replace RTF with XamSyntaxEditor.

Now this userControl  is refered many places ,where we initialize text to Editor's document , user performs operation like modify,copy paste etc .

It works everywhere fine , but on Few forms  where same control is  refered (with XamSyntaxEditor ) ,I get exception :

"Value can not be null ,Parmeter name newOrReformattedLines"

Its really strange that  same usercontrol works on similar kind of forms and on some forms  EXE crashes with this exception.

'newOrReformattedLines' is related to XamsyntaxEditor ,I was debugging into code since  2 days and no clue how to resolve this exception.

-Aparna

Hello Aparna,

I am just checking were you able to create a sample, where the issue is reproducible, so we can investigate this further for you?

Looking forward for your reply.

Hi Stefan ,

In my project where exception occus ,there are lots of  events getting called in baground.

I was trying  to create simple application  with  similar flow in which exception occurs ,but I can not reproduce issue in stand alone application .

Hello Aparna,

I have been looking into the exception, but since this is not a known issue, without a sample project, where this is reproduced we are not able to investigate this further for you.

Hi Stefan ,

I have attached  sample  which reproduce  crash mentioned above .

(Note : To run EXE you need to change  Infragistics DLL references to yur local DLL references,I have removed  DLL as  f they were causing huge size of zip file upto 6MB )

When you run  EXE 1st time you will get Argumet exception in TextDocument   and Compatability Error  .

On Compatibility Error when youe click on Close button .

Again Run EXE  now you will get  argumentNullReference Exception in XamSyntaxEditor ,related to  parameter 'newOrReformattedLines'

Looking forward for your feddback on this issue.

Hello Aparna,

I have been looking into the sample you have attached and I was able to reproduce the first exception you mentioned and I can suggest you use the Document's Append method instead of InitializeText one on the setter of the Text property. Could you please try this and see if the second exception will continue to occurs.

Looking forward for your reply.

Hi Stefan ,

Using  Append method  crash doesnt occured in code  which I have provided , But if I use append instead  of initialize text  in my actual class crash still exist.

Also if  append intead of initialize text doesnt serv  the actual purpose , even if I add condition checks etc in some scenarios text get appended .

What is exact cause of this error ? How  I can resolve it ?