System.IO.FileStream Fs = New System.IO.FileStream ("File Path and Name", IO.FILEMODE.Open, IO.FILEACCESS.READ;
Byte [] IMGData = new byte [fs.length];
fs.read (IMGDATA, 0, FS.LENGTH);
SqlConnection conn = new sqlconnection ("...");
SqlDataAdapter Da = New SqlDataAdapter ("SELECT ...", CONN);
DataSet DS = New Dataset ();
Da.fill (DS);
SQLCommandbuilder CB = New SQLCOMMAndBuilder (DA);
DS.Tables [0] .ROWS [0] ["IMG"] = IMGDATA;
Da.UPDATE (DS);
Where the IMG field is an Image type.