security - Single quote character in query string causes SQL injection -

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i wondering if adding single quote mark embedded query string parameter in hard coded sql query cause sql injection error? can see after @docnum parameter using both percent , single quote characters. somewhere in code causing error. if use single percent character % instead of both % , single quote character %' unlike in stringbuilder appended line below stop error occurring?

sb.append("and docnumtcn  thumbsdown @docnum%' " );

if i'm correct here, suspect you're trying document number can like another. perhaps you're trying achieve this:

sb.append("and docnumtcn '%' + @docnum + '%' ")

the confusing part thumbsdown field you've got in there.


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