Grayscale pixels byte array

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C#

I've got a byte array 100x100 which comes form a miniature camera 50 times per second. Each byte from the array contains an information about shade of grey value. I draw an image (100x100 pixels) using an information from this array. To do this I use Rectangle.Fill method. The problem is that this method draws the image very slowly, but I want to draw the image at a rate about 50 frames per second. What is the best way to do this?