How Can I Hide Data In An Image Using Skin Tone Based Staganography

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C#

How Can I Hide Data In An Image Using Skin Tone Based Staganography
i have used this one..but it shows many errors...
class SteganographyHelper
{
enum State
{
hiding,
filling_with_zeros
};

public static Bitmap embedText(string text, Bitmap bmp)
{
State s = State.hiding;

int charIndex = 0;
int charValue = 0;
long colorUnitIndex = 0;

int zeros = 0;

int R = 0, G = 0, B = 0;

for (int i = 0; i < bmp.Height; i++)
{
for (int j = 0; j < bmp.Width; j++)
{
Color pixel = bmp.GetPixel(j, i);

pixel = Color.FromArgb(pixel.R - pixel.R % 2,
pixel.G - pixel.G % 2, pixel.B - pixel.B % 2);

R = pixel.R; G = pixel.G; B = pixel.B;

for (int n = 0; n < 3; n++)
{
if (colorUnitIndex % 8 == 0)
{
if (zeros == 8)
{
if ((colorUnitIndex - 1) % 3 < 2)
{
bmp.SetPixel(j, i, Color.FromArgb(R, G, B));
}

return bmp;
}

if (charIndex >= text.Length)
{
s = State.filling_with_zeros;
}
else
{
charValue = text[charIndex++];
}
}

switch (colorUnitIndex % 3)
{
case 0:
{
if (s == State.hiding)
{
R += charValue % 2;

charValue /= 2;
}
} break;
case 1:
{
if (s == State.hiding)
{
G += charValue % 2;

charValue /= 2;
}
} break;
case 2:
{
if (s == State.hiding)
{
B += charValue % 2;

charValue /= 2;
}

bmp.SetPixel(j, i, Color.FromArgb(R, G, B));
} break;
}

colorUnitIndex++;

if (s == State.filling_with_zeros)
{
zeros++;
}
}
}
}

return bmp;
}

public static string extractText(Bitmap bmp)
{
int colorUnitIndex = 0;
int charValue = 0;

string extractedText = String.Empty;

for (int i = 0; i < bmp.Height; i++)
{
for (int j = 0; j < bmp.Width; j++)
{
Color pixel = bmp.GetPixel(j, i);

for (int n = 0; n < 3; n++)
{
switch (colorUnitIndex % 3)
{
case 0:
{
charValue = charValue * 2 + pixel.R % 2;
} break;
case 1:
{
charValue = charValue * 2 + pixel.G % 2;
} break;
case 2:
{
charValue = charValue * 2 + pixel.B % 2;
} break;
}

colorUnitIndex++;

if (colorUnitIndex % 8 == 0)
{
charValue = reverseBits(charValue);

if (charValue == 0)
{
return extractedText;
}

char c = (char)charValue;

extractedText += c.ToString();
}
}
}
}

return extractedText;
}

public static int reverseBits(int n)
{
int result = 0;

for (int i = 0; i < 8; i++)
{
result = result * 2 + n % 2;

n /= 2;
}

return result;
}
}