private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) 
      { 
	 const int N=100;
	 double size=1.0;
	 double x,y;
	 double h=size/N;
	 double Xkoef= (pictureBox1->Width)/size;
                 double Ykoef= (pictureBox1->Height)/size;
	 Graphics^ g = pictureBox1->CreateGraphics();
                  Pen^ bluePen = gcnew Pen( Color::Blue,1.0f );
  	 SolidBrush^ hBrush = gcnew SolidBrush (Color::Red);
                  for ( int i=1 ; i<=N ; i++)
	 {
	       for ( int j=0 ; j<=N ; j++)
                       {
	               x= (i)*h * Xkoef;
                               y= (j)*h * Ykoef;
	               g->FillRectangle( hBrush,Rectangle(x, y,(x + h*Xkoef),(y + h*Ykoef)));
	               g->DrawRectangle(bluePen,Rectangle(x, y,(x + h*Xkoef),(y + h*Ykoef)));
	       }
	 }
 }

public:
void FillRectangle(Brush^ brush, 
	float x, float y, float width, float height)

		void Button1Click(object sender, EventArgs e)
		{
			const int N=100;
			float size=1.0f;
			float h=size/N;
			float Xkoef= (pictureBox1.Width)/size;
			float Ykoef= (pictureBox1.Height)/size;
			Graphics g = pictureBox1.CreateGraphics();
			Pen bluePen = /*gc*/new Pen( Color.Blue, 1.0f );
			Pen redPen = /*gc*/new Pen( Color.Red, 1.0f );
			SolidBrush hBrush = /*gc*/new SolidBrush (Color.Red);
			SolidBrush hBrush2 = /*gc*/new SolidBrush (Color.Blue);
			
			float y = 0;
			for(int j = 0; j <= N; j++)
			{
				float x = h * Xkoef;
				for(int i = 1; i <= N; i++)
				{
					if ((i + j) % 2 == 1)
					{
						g.FillRectangle( hBrush, x, y, h * Xkoef, h * Ykoef);
					}
					else
					{
						g.FillRectangle( hBrush2, x, y, h * Xkoef, h * Ykoef);
					}
					x += h * Xkoef;
				}
				y += h * Ykoef;
			}
		}

SolidBrush^ hBrush = gcnew SolidBrush (Color::FromArgb(255,0,0));

hBrush = gcnew SolidBrush (Color::FromArgb(2*i,0,j));

SolidBrush^ hBrush = gcnew SolidBrush (Color::FromArgb(255,0,0));

// а потом, в цикле:
hBrush->Color = Color::FromArgb(2*i, 0, j);

freopen("info.txt","w",stdout);
cout<< m*N << '\n';

FILE* pFile;
pFile=fopen("info.txt","r");
for(int i = 0; i <= N; i++)
{
      for(int j = 0; j <= N; j++)
      {
	fscanf(pFile,"%lf",&U[i][j]);
       }
}

freopen("info.txt","r", stdin);
// ...
cin >> value;

		void btnReadMatrixClick(object sender, EventArgs e)
		{
			openFileDialog1.ShowDialog();
			TextReader sr = new System.IO.StreamReader(openFileDialog1.FileName);
			int Len = Convert.ToInt32(sr.ReadLine());
			
			string s = sr.ReadToEnd();
			string[] sArr = s.Split('\n');
			
			int[,] iArr = new int [Len, Len];

			// Вот, собственно, пропускаем первую часть, от 0 до Len - 1...
			for(int i = Len; i < sArr.Length; i++)
			{
				int j = 0;
				foreach(string st in sArr[i].Split(' '))
				{
					iArr[i - Len, j++] = Convert.ToInt32(st);
				}
			}			
		}

int Len = Convert::ToInt32(myStream->ReadLine());
						String^ s = myStream->ReadToEnd();
						array<String^>^ sArr = s->Split('\n');
			
						int[,] iArr = new int [Len, Len];
	
						// Вот, собственно, пропускаем первую часть, от 0 до Len - 1...
						for(int i = Len; i < sArr->Length; i++)
						{
							int j = 0;
							for each(String^ st in sArr[i]->Split(' '))
							{
								iArr[i - Len, j++] = Convert::ToInt32(st);
					    	}
					    }

 String^ GetExceptionType( Exception^ ex )
{
   String^ exceptionType = ex->GetType()->ToString();
   return exceptionType->Substring( exceptionType->LastIndexOf( '.' ) + 1 );
}

void ConvertToDouble( String^ numericStr, Object^ defaultValue  )
{
   try
   {
      defaultValue = Convert::ToDouble( numericStr );
   }
   catch ( Exception^ ex ) 
   {
      defaultValue = GetExceptionType( ex );
	 
   }

ConvertToDouble( st, temp );
U[i - Len][j++] =temp;

NumberFormatInfo^ Provider = gcnew NumberFormatInfo;
Рrovider->NumberDecimalSeparator = ".";
// и вызов
U[i - Len][j++] = Convert::ToDouble(st, Provider);