Help understanding this stack trace

Question

I have health monitoring turned on, and i have the following error i'm trying to understand: Exception: ``` Exception information: Exception type: System.InvalidCastException Exception message: Specified cast is not valid. Thread information: Thread ID: 5 Thread account name: NT AUTHORITY\NETWORK SERVICE Is impersonating: False Stack trace: at _Default.Repeater1_ItemDataBound(Object sender, RepeaterItemEventArgs e) at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) at _Default.up1_Load() at _Default.Timer1_Tick(Object sender, EventArgs e) at System.Web.UI.Timer.OnTick(EventArgs e) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) ``` I'm just trying to figure out exactly where the problem is happening and what it is - is it…

Accepted Answer

The wikipedia entry on stack traces should help a little, but essentially a stack trace is a list of methods / functions that a thread / the program is in at a given time (usually during an exception).

The top most line in a stack trace is the method / function that the thread / program is "currently in" (i.e. currently executing), the next line is the method / function that is calling the method given in the line above, etc...

So for example, if I have the following code (in C#):

```
void Timer1_Tick()
{
    SomeMethod();
}

void SomeMethod()
{
    AnotherMethod();
}

void AnotherMethod()
{
    // Suppose I have a exception / stack trace taken at this point
}
```

I might get the following stack trace:

```
AnotherMethod()
SomeMethod()
Timer1_Tick()
```

In short - its likely that your error is somewhere in the method `Repeater1_ItemDataBound`, as that is the "outermost" / topmost method in your stack trace.

Help understanding this stack trace

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