Steganography image in c#

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C#

.NET

Hi everyone!
I need some help.

i am trying to do a steganography program!
What i have imlemented is this:
I get the pixel.B value from the original image and i store all of them in a list<int> called ImgInt.
Then i convert the ints into bits and store every single bit 0, 1 in a list<int> ImgBits.
I do the same for the text with two lists TxtInt and TxtBits.

Then i replace the bits 7 - th, 15 - th, 23 - rd, 31 - st, 39 - th and go on of the ImgBits list with the bits from TxtBits list.
Later i convert back to int the values of ImgBits list and i set them to the pixel.B value of image and by this way i create the encrypted image.

The problem is that when i try to get the pixels from the encrypted image they are different from the ones that i set.

These are the int value of the combination pxl - txt bits which i set to the enckryted image

Pixelit [0][0] = 198
Pixelit [0][1] = 198
Pixelit [0][2] = 198
Pixelit [0][3] = 199
Pixelit [0][4] = 199
Pixelit [0][5] = 200
Pixelit [0][6] = 200
Pixelit [0][7] = 200
Pixelit [0][8] = 199
Pixelit [0][9] = 199
Pixelit [0][10] = 199
Pixelit [0][11] = 200
Pixelit [0][12] = 200
Pixelit [0][13] = 201
Pixelit [0][14] = 201
Pixelit [0][15] = 201
Pixelit [0][16] = 201
Pixelit [0][17] = 200
Pixelit [0][18] = 198
Pixelit [0][19] = 197
Pixelit [0][20] = 197
Pixelit [0][21] = 198
Pixelit [0][22] = 198
Pixelit [0][23] = 199
Pixelit [0][24] = 199
Pixelit [0][25] = 200
Pixelit [0][26] = 202
Pixelit [0][27] = 202
Pixelit [0][28] = 202
Pixelit [0][29] = 201
Pixelit [0][30] = 199
Pixelit [0][31] = 196
Pixelit [0][32] = 202
Pixelit [0][33] = 200
Pixelit [0][34] = 200
Pixelit [0][35] = 200
Pixelit [0][36] = 200
Pixelit [0][37] = 200

These are the values of pixel.b that i get from the enckrypted when i start to deckrypt.

Pixelit [0][0] = 198
Pixelit [0][1] = 201
Pixelit [0][2] = 196
Pixelit [0][3] = 196
Pixelit [0][4] = 199
Pixelit [0][5] = 196
Pixelit [0][6] = 201
Pixelit [0][7] = 199
Pixelit [0][8] = 196
Pixelit [0][9] = 199
Pixelit [0][10] = 197
Pixelit [0][11] = 198
Pixelit [0][12] = 198
Pixelit [0][13] = 203
Pixelit [0][14] = 200
Pixelit [0][15] = 201
Pixelit [0][16] = 200
Pixelit [0][17] = 203
Pixelit [0][18] = 201
Pixelit [0][19] = 198
Pixelit [0][20] = 199
Pixelit [0][21] = 199
Pixelit [0][22] = 199
Pixelit [0][23] = 202
Pixelit [0][24] = 196
Pixelit [0][25] = 199
Pixelit [0][26] = 201
Pixelit [0][27] = 202
Pixelit [0][28] = 201
Pixelit [0][29] = 201
Pixelit [0][30] = 199
Pixelit [0][31] = 200
Pixelit [0][32] = 198
Pixelit [0][33] = 199
Pixelit [0][34] = 201
Pixelit [0][35] = 200

This two sets of values have to identical.

Thanks in advance!