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i have a field in my sql database that is saved a binary data,
this binary data is a zipped file.
how to read this data and convert it to zip file?

Just retrieve the data as binary and then save it (with zip extension) using a BinaryWriter[^].
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Hope u r using

 // Initalize connection before this
SqlCommand cmd=new SqlCommand("select zipdat from table",con); //con for sqlconnection

//zipdat is column where you stored bytes of zip file


byte [] zipbts=(byte[])cmd.ExecuteScalar();


Hope this helps

best of luck..........
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