Friday, August 4, 2017

WCF Transport Quotas

Check out this article "Making Sense of Transport Quotas".

Monday, April 24, 2017

Session is Null with SQL Server Session Mode

The Problem

Session variable works fine with InProc Session Mode but is null when you switch the Session Mode to SQLServer mode. 
You may see the following exception.
"Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode." 

Make sure you check the inner exception to see which class needs to be changed to Serializable.

Review all the data you have stored in Session variables to verify the data is serializable.  .NET knows how to automatically serialize the simple built in types like string, enum, integer, etc. Any classes you create are NOT serializable by default. Fortunately, you can make your classes serializable with a simple class attribute of [Serializable] like this.

public class Address
       public int      nStreetNum;
       public string strStreetName;

public class Customer
      public string strFirstName;
      public string strLastName;
      public Address Addr;  // The Address class must be serializable.

      public Customer(string FirstName, string LastName, Address theAddr)
          strFirstName = FirstName;
          strLastName = LastName;
          Addr = theAddr;

Your class must meet these requirements to be serializable:

  • Your class must have the Serializable attribute
  • Any classes it derives from must have the Serializable attribute.
  • All class member variables must be serializable types.  For example, the Address type used for Customer Addr member variable must also be serializable.

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Saturday, April 8, 2017

Get Session Variable and Check for Null

Accessing a Session variable that hasn't been created causes a null exception.   You can use the C# null-coalescing(??) or 'as' operators to simplify and avoid a null exception.

First two examples yield the same result;
myClassObj will receive the myClassObj stored in the Session variable if it exists; otherwise null.

With ?? Operator

   MyClass myClassObj = (MyClass)Session["mySessionName"] ?? null;

With as Operator

   MyClass  myClassObj = Session["mySessionName"] as MyClass 

With Both Operators

   string strMyClass = Session["mSessionName"] as string ?? "";

Saturday, January 21, 2017

Cannot Drag Windows Explorer to Another Monitor

Problem: Windows Explorer window cannot be dragged to another monitor.

Solution:  Turning Snap feature off and then back on solved the issue.   
  • Right-click on your desktop
  • Select Display Settings > Multitasking > Snap
  • Slide Snap to off and then back on again. I have the remaining three options turned on also. 

Turn Snap feature off if that doesn't work. 

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Friday, January 13, 2017

RadWindowManager in User Control Can Cause Confusion

I had a RadWindowManager in a user control that was loaded dynamically in an aspx page which also had it's own RadWindowManager.   So now there are two RadWindowManagers on the page after the user control was loaded. 

The following comes from a post at a Telerik forum:
  1. the radopen() function can be used only when a RadWindowManager is declared on the page.
  2. If there are multiple RadWindowManagers on the page, radopen() will use the first rendered manager. 

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Thursday, January 12, 2017

C# Language Specification

The C# language specification is available online and may even be on your hard drive right now. 

Visit if you need custom software development.