CreateParameter with varbinary

I am trying to create queries to store a MD5 encoded password in SQL server field with datatype varbinary(50)

I get the error "Application uses a value of the wrong type for the current operation. "

Below is the code.  What's going wrong??

<%

Set cmdSetPassword = Server.CreateObject ("ADODB.Command")
cmdSetPassword.ActiveConnection = MM_sqldb_STRING
cmdSetPassword.CommandText = "UPDATE Users  SET Password = ? WHERE Username = ?"
cmdSetPassword.Parameters.Append cmdSetPassword.CreateParameter("varPassword", 204, 1, 50, MM_IIF(varPassword, varPassword, cmdSetPassword__varPassword & ""))
cmdSetPassword.Parameters.Append cmdSetPassword.CreateParameter("varUsername", 200, 1, 50, MM_IIF(varUsername, varUsername, cmdSetPassword__varUsername & ""))
cmdSetPassword.CommandType = 1
cmdSetPassword.CommandTimeout = 0
cmdSetPassword.Prepared = true
cmdSetPassword.Execute()

%>
probelawAsked:
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Anthony PerkinsCommented:
>>At the moment I believe it is just a binary value resulting from the MD5 function<<
Since there is no data type called "binary" in VB I would suggest you set it to variant when you pass it to a parameter in a stored procedure defined as varbinary.  However I would suggest you instead define it as string and change the stored procedure and table to use a varchar data type.
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Anthony PerkinsCommented:
>>store a MD5 encoded password in SQL server field with datatype varbinary(50)<<
Any reason to use varbinary?  Why not use varchar?

What is the data type for the value you are assigning to the password?

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probelawAuthor Commented:
At the moment I believe it is just a binary value resulting from the MD5 function

i.e....

varPassword = MD5(Password)

Should it be declared a specific way?
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probelawAuthor Commented:
Changing the datatype in the database to varchar and the parameter to the same works well.  Is there any big difference or risk to doing it this way?

Thanks for the help.
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Anthony PerkinsCommented:
No.
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