Hi all, i am working on a C DLL which takes all inputs as pointer values...unmanaged code [DllImport("Ziee_Mask.dll")] unsafe public static extern void IQ_Data_to_Spectrum(double* Spec, double* Real, double* Img, Int32 len); where the inputs are real and img values should be read from a excel sheet and provided as input around 65536 values ...len is 65536(length) .. output is a array of data in "spec" ... i need to store the input data from excel sheet and pass to function and take output from spec and store it i tried some of the ways which ends up in hanging of forms ...I am new to c sharp....Somebody please help me...