I am getting exception while accesing the SQlite dll. "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

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C#

SQLite

Hi,
I create one class which is inherited from SqliteFunction. I want to use that class as Sqlite function.
I am getting exception while accessing the method "UnsafeNativeMethods.sqlite3_value_blob(xAsIntPtr)". viz:

"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

public static class UnsafeNativeMethods
{
 [System.Runtime.InteropServices.DllImportAttribute("System.Data.SQLite.dll", EntryPoint = "sqlite3_value_blob", CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
public static extern IntPtr sqlite3_value_blob([System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.SysUInt)]IntPtr p);
}

[SQLiteFunction(Name = "rank", Arguments = 3, FuncType = FunctionType.Scalar)]
class myFunction: SQLiteFunction
   {

       public override object Invoke(object[] args)
       {
           //return base.Invoke(args);
           return myFunction((byte[])args[0],(long)args[1],(long)args[2]);
       public  static double myFunction(byte[] pCtx, long nVal, long b)
       {
           IntPtr xAsIntPtr = new IntPtr(x);
           long x = b;
           long[] apVal = digitArr(b); //digitArr convert the long to array of long
          long[]matchinfo=digitArr((long)UnsafeNativeMethods.sqlite3_value_blob(xAsIntPtr));//<small>--exception</small>

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