.net - Delphi send null string to webservice -

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i'm using webservice delphi application, but, in webservice, parameter's value null.

here web service code in .net

[webmethod] int execsql(string asql) { }

in delphi use : delphi method using web service have used

i don't know wrong ? delphi application or .net webservice ?

add service unit:

invregistry.registerinvokeoptions(typeinfo(xxx), iodocument);

read here: https://www.bobswart.nl/weblog/blog.aspx?rootid=5:798


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