Шахматная доска в Windows Forms Application

 #pragma endregion
public: System::String^ convertIntToString(int n)
{
switch (n)
{
case 0: return "a";
case 1: return "b";
case 2: return "c";
case 3: return "d";
case 4: return "e";
case 5: return "f";
case 6: return "g";
case 7: return "h";
default: return " ";
}
 
}
private: System::Void pictureBox1_Paint(System::Object^ sender, System::Windows::Forms::PaintEventArgs^ e) {
 
 
Pen^ blackPen = gcnew Pen(Color::Black,1);
Pen^ whitePen = gcnew Pen(Color::White,1);
SolidBrush^ blackBrush = gcnew SolidBrush(Color::Black);
SolidBrush^ whiteBrush = gcnew SolidBrush(Color::White);
 
 
int x=20,y=20;
int i,j;
for (i=0;i<4;i++)
for (j=0; j<4; j++)
{
Rectangle blackRect1(x+j*40,y+i*40,20,20);
e->Graphics->DrawRectangle(blackPen,blackRect1);
e->Graphics->FillRectangle(blackBrush,blackRect1);
 
Rectangle whiteRect1(x+j*40+20,y+i*40,20,20);
e->Graphics->DrawRectangle(whitePen,whiteRect1);
e->Graphics->FillRectangle(whiteBrush,whiteRect1);
 
Rectangle whiteRect2(x+j*40,y+i*40+20,20,20);
e->Graphics->DrawRectangle(whitePen,whiteRect2);
e->Graphics->FillRectangle(whiteBrush,whiteRect2);
 
Rectangle blackRect2(x+j*40+20,y+i*40+20,20,20);
e->Graphics->DrawRectangle(blackPen,blackRect2);
e->Graphics->FillRectangle(blackBrush,blackRect2);
}
 
System::Drawing::Font^ myFont = gcnew
System::Drawing::Font("arial",10);
for (i=0;i<8;i++)
{
e->Graphics->DrawString(Convert::ToString(8-i),myFont,blackBrush,x-15,y+i*20);
e->Graphics->DrawString(Convert::ToString(8-i),myFont,blackBrush,x+165,y+i*20);
 
e->Graphics->DrawString(convertIntToString(i),myFont,blackBrush,x+5+i*20,y-20);
e->Graphics->DrawString(convertIntToString(i),myFont,blackBrush,x+5+i*20,y+165);
}
 
 
}
};
}

String ^ letters = "abcdefgh"