C#

unsafe public int ArrayFixed() {
    int dim=1000;
    int[] numbers=new int[dim];
    ...
    int sum;
    fixed (int* pNumbers=&numbers[0]) {
        sum=SumArray(pNumbers, dim);
    }
    return sum;
}

[DllImport("native.dll")]
unsafe public static extern int SumArray(int* pNumbers, int count);

public int ArrayHandle() {
    int dim=10000;
    int[] numbers=new int[dim];
    ...
    GCHandle handle=GCHandle.Alloc(numbers, GCHandleType.Pinned);
    int sum=SumArray(handle.AddrOfPinnedObject(), dim);
    handle.Free();
    return sum;
}

[DllImport("nativeC.dll")]
public static extern int SumArray(IntPtr pNumbers, int count);

colNameAttribute mAttribInstance = (colNameAttribute)c.GetType()
                    .GetCustomAttributes(typeof(colNameAttribute),false).GetValue(0);

///remember the array index is 0. you can change it accordingly... //// 

Class yourClass 
{
  public string GetColName()
  {
    colNameAttribute mAttribInstance = (colNameAttribute)this.GetType().GetCustomAttributes(typeof(colNameAttribute),false).GetValue(0);
   
    return mAttribInstance.Name;
  }
}

Bitmap bmp = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
               Graphics gp = Graphics.FromImage(bmp);

               gp.CopyFromScreen(0, 0, 0, 0, new Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height));
               ms = new MemoryStream();
               Image im = bmp.GetThumbnailImage(Screen.PrimaryScreen.Bounds.Width / 10, Screen.PrimaryScreen.Bounds.Height / 10, null, IntPtr.Zero);
               bmp = new Bitmap(im);
               bmp.Save(ms, ImageFormat.Jpeg);
               by = ms.GetBuffer();
               return by;