Unable to cast COM object error when calling COM from .NET C# worker thread

Line 1178:            get {
Line 1179:                try {
Line 1180:                    return ((string)(this[this.tablemember.CurrentCityStateColumn]));
Line 1181:                
 Closing a WPF form from another thread?? The calling thread cannot access this object because a diff 
  
I have a WPF form with a Close buttom which just does
this.Close();
I also have a public method in this WPF form which goes like this
public void doClose()
{
  this.Close();
}
doClose() is supposed to be called by other classes but I keep getting this runtime error when this method is called:
The calling thread cannot access this object because a different thread owns it.
Please tell me how to solve it.
Thanks.
Jessi
1 + 1 = 3
 Unable to cast COM Object - Exception 
  
Hi everyone,
Ive been trying to develop a COM Client application, but without success. My goal is to create an application that can open reports in Cognos Impromptu. Ive got Cognos Impromptu installed on this machine and im using Visual Studio 2008 to develop the client.
I created my project as a consoleapplication in Visual Studio. Next, I added the Impromptu Client Reference via Project > Add Reference > COM. All works fine till now, Visual Studio creates my COM Wrapper dll and adds it to the bin/debug folder.




But when I trry to run my program, it gives me the following Exception:
Unable to cast COM object of type 'ImpromptuClient.ImpromptuApplicationClass' to

 interface type 'ImpromptuClient.IAppAuto'. This operation failed because the Qu

eryInterface call on the COM component for the interface with IID '{2F835754-FB4

F-11CF-8E5F-00401C60350D}' failed due to the following error: No such interface

supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

Press any key to continue . . .
The code I use is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.
 Unable to cast object of type 'System.Data.SqlClient.SqlCommand' to type 'System.IConvertible'. 
  

using

System;

using

System.Collections;

using

System.Configuration;

using

System.Data;

using

System.Linq;

using

System.Web;

using

System.Web.Security;

using

System.Web.UI;
 Dynamic controls added at runtime, threading, The calling thread cannot access this object because a 
  
Hi,
 
My problem is on load I initialise a new thread. This thread create a new control then tries to add the control to a stackapnel and the error I receive is -
The calling thread cannot access this object because a different thread owns it.
Heres is my code e-

Thread

 

 

t =
new
 Error: Object cannot be cast from DBNull to other types. 
  
anyone can help me... 
here's my error...
Exception Details: System.InvalidCastException: Object cannot be cast 
from DBNull to other types.
here's my code.
double totald = Convert.ToDouble(drReaderdeduc["TAMT"]);
totaldeduc.Text = String.Format("{0:N2}", totald);
the problem is the query output is null but i convert.todouble so got an error... what is the best solution if the record is null??? please help....

 Unable to cast Application state object 
  
In global.asax:
-I have defined a struct (my_struct)
-I add a List of structs (List<my_struct>) to Application["MyList"]   
In default.aspx:
-I have defined the exact struct (my_struct) and want to cast the Application["MyList"] object to the List of structs. 
example: x = (List<my_struct>)Application["MyList"];
I receive this error "Unable to cast object of type 'System.Collections.Generic.List`1[ASP.global_asax+my_struct]' to type 'System.Collections.Generic.List`1[_Default+my_struct]'