[ThreadStatic] - very useful C# attribute, means that class member is static in this thread only, all other threads have different values.

Question mark

Not so long ago I started to observe some strange variable declarations in C#. That were quotation marks after type name.

bool? flag;

Goolge and yandex investigations gave nothing, but today I discovered what it means. Quotation mark changes non-nullable type to nullable. So simple :).

How to create TreeView using Infragistics' XamDataGrid Class

The main issue that I faced while solving this task was in method DataItems.Add(object). If you pass as parameter your object then all public fields will be displayed in grid. To make a hierarchy you need to add public property of type List<SomeClass> to your class.

Change background color in CEdit (MFC)

It was a real challenge for me to make a simple change of background color for CEdit. I was suprised to find out that there are no standard function, like CEdit::SetBkColor, to do this.

1. first step is to create class derived from CEdit and declare function CtlColor:

// CustomEdit.h
class CCustomEdit : public CEdit
{
protected:
  HBRUSH CtlColor(CDC *pDC, UINT);
  DECLARE_MESSAGE_MAP()
};

2. handle WM_CTLCOLOR_REFLECT event:

// CustomEdit.cpp
BEGIN_MESSAGE_MAP(CCustomEdit, CEdit)
  ON_WM_CTLCOLOR_REFLECT()
END_MESSAGE_MAP()

HBRUSH CCustomEdit::CtlColor(CDC *pDC, UINT)
{
  COLORREF bkColor = RGB(255, 255, 255);
  pDC->SetBkColor(bkColor);
  return CreateSolidBrush(bkColor);
}

My First Entry ))