There is a default limit on 'uploads' to an ASP.Net web page of 4MB, but this can be increased if required:
http://msdn.microsoft.com/en-us/library/e1f13641(VS.80).aspx
There isn't a specific limit on the size of a string variable in either .Net or SOAP, but obviously be careful how you process it so you use the least amount of memory.
/- Sam Judson : Wrox Technical Editor -/
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