C#

No overload for method 'PassStructIn' takes 4 arguments

class Program
    {
        public struct Quaternion
      {
          double w; double x; double y; double z;
      }

      [DllImport("YLScsDrawing.dll")]
      public static extern void PassStructIn(ref Quaternion myQuaternion);

        static void Main(string[] args)
        {
        Program.Quaternion myQuaternion;
        Program.PassStructIn(ref myQuaternion);

        //Yada Yada Yada

        //Then the threading of said function...

        // Abs threads
        Thread absoluteThread = new Thread(unused => Program.PassStructIn((double)absW, (double)absX, (double)absY, (double)absZ));
        absoluteThread.Start();
      	// Abs threads

<br />
An unhandled exception of System.AccessViolationException occured in CSharpProgram.exe.<br />
Attempted to read or write protected memory.<br />

[DllImport("MyDll.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int Call_Dll_Main(string input, string output);

private void Button_Click(object sender, EventArgs ea)
{
   new System.Threading.Thread(new System.Threading.ThreadStart(Call_Dll_Function)).Start()
}

private void Call_Dll_Function()
{
    int nResult = Call_Dll_Main(txtInputFile.Text.Trim(), txtOutputFile.Text.Trim()); // HERE EXCEPTION COMES...FIRST TIME FINE...IT COMES SECOND TIME I CLICK THE BUTTON
}