Bizarre exception: null reference

[User (Legacy)]

I get this error on a postback. The page/chart loads perfect on the initial 

load. I've set break points at PageLoad and the exception occurs before 

that. I'm running the latest updates to dev studio. It seems to occur before 

the postback is actually handled

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the 

current web request. Please review the stack trace for more information 

about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set 

to an instance of an object.

Source Error:

      An unhandled exception was generated during the execution of the 

current web request. Information regarding the origin and location of the 

exception can be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an 

object.]

   SoftwareFX.ChartFX.Internet.Server.ChartCore.6A(Object 10C) +528

   SoftwareFX.ChartFX.Internet.Server.ChartCore.Import(FileFormat format, 

Stream stream) +403

   SoftwareFX.ChartFX.Internet.Server.ChartCore.Import(FileFormat format, 

String fileName) +69

   SoftwareFX.ChartFX.Internet.Server.Chart.LoadViewState(Object objState) 

+87

   System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +136

   System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +414

   System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +414

   System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +414

   System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +414

   System.Web.UI.Page.LoadPageViewState() +306

   System.Web.UI.Page.ProcessRequestMain() +447

[Software FX]

Right after this error occurs, please go to ChartFX62/Temp and look for the 

most recent CHW file. Attach this file to your posting. This should help us 

determine the cause of this problem.

-- 

FP

Software FX

[User (Legacy)]

here is the chw.

please keep in mind the initial chart loads fine (w/ data). The goal of the 

postback is to change the datasource of the same chart object and rebind the 

data, it doesn't ever reach this point however.

"SoftwareFX Support" <noreply@softwarefx.com> wrote in message 

news:y7ONR125EHA.3492@webserver3.softwarefx.com...

> Right after this error occurs, please go to ChartFX62/Temp and look for 

> the

> most recent CHW file. Attach this file to your posting. This should help 

> us

> determine the cause of this problem.

>

> -- 

> FP

> Software FX

>

>

[Software FX]

For some reason. The chart being generated here has some inconsistent 

properties that makes it crash when it Loads from the saved ViewState.

I can see what's wrong with the file but I can not determine why is this 

happening.

Can you provide with a repro case ? do you have a WebForms app that I can 

run here that reproduces the problem ? If this is not possible, can you 

please post the code that configures the chart, in particular anything that 

you are doing with the LegendBox, ClearData would be of interest to me.

-- 

FP

Software FX

[User (Legacy)]

well, it seems to work now ??

I fired up the .sln to get the source, couldn't build because cfx dlls were 

"access denied" on build (new error). Deleted bin directory, gave myself 

Full control on the c:\program files\ChartFx.. dir and sub dirs as well as 

BIN. Rebuild was fine (normal). Launched IE navigated to local chart, did 

postback and everybody is fine.

This all arose when i went to fix something w/ the dates at the bottom of 

the graph. When a user would change their preference from a Line gallery to 

a Bar gallery, the Bar graph would show 2 dates at the bottom and one would 

be 6 days in the future. (see attached -  both are generated in the same 

session from the same dataset) This appears to be ok now as well. Maybe just 

some .Net DLL run-a-muckery. Thanks for the help, maybe you can bill MS for 

your time... 

Anyway, here was the code to bind the data to the chart if it still 

interests you --- I added the cleardata line to try and fix the date 

problem, turns out it makes no difference.

private void BindGraph(string TableName)

{

PSTrendedTable table = GetSite().Tables[TableName];

if (table == null)

{

ViewState["Err"] = true;

ErrLabel.Text = "There is no data for this site.";

return;

}

cfxGraph.ClearData( SoftwareFX.ChartFX.ClearDataFlag.AllData );

ViewState["CurrentTable"] = TableName;

PSTrendedTableProperties props = new PSTrendedTableProperties( CONNSTR );

props.Load( table.TableRefKey );

// ========= Set Title ========== //

cfxGraph.Titles[0].Text = TableName.Trim();

switch( table.UOM )

{

case 0: cfxGraph.Titles[0].Text += "