How to pass NULL or empty strings to stored procedure input parameter with ADO and VB?

Question

I have a stored procedure in Sql Server 2005 with a varchar input parameter defined as:

@Value varchar(24) = NULL

in my VB6 application I t

Answer 1

if you want to pass a blank string to a parameter us adBSTR instead of adVarChar. It works for strings longer than zero chars too

eg (where oCmd is the command object in question):

oCmd.Parameters.Append oCmd.CreateParameter("@Parm", adBSTR, adParamInput, len(sParm), sParm)