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byte[] byt = Convert.ToByte(ds1.Tables[0].Rows[0]["Doc"]);

Instead of Convert coming error like this ...

Cannot implicitly convert type 'byte' to 'byte[]'

Can any one solve this please...

byte[] bytes = System.Text.Encoding.ASCII.GetBytes(ds1.Tables[0].Rows[0]["Doc"].tostring());

try this :)
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Convert.ToByte converts a numeric string to a byte. You want an array of bytes intead.
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(myString);
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