Does
this[
^] help?
I'm also curious why use a parameter for the blob field, but not for the location.
Do this:
string query = "insert into signtable(Cname,Csign) values(:saveLocation, :BlobParameter)"
and add the savelocation as parameter as well.
also it could be that
blobParameter.ParameterName = "BlobParameter";
should be
blobParameter.ParameterName = ":BlobParameter";