SqlParameter X is already contained by another SqlParameterCol lect

[kevin]

....using VS2003 and the Enterprise Library

whenever I want to use an SP I query the database for the parameters
(INFORMATION_SC HEMA.PARAMETERS ) and then populate the command objects
parameters collection like thus (params is an array of SqlParameters)

foreach(SqlPara meter p in params){
dbcmd.Command.P arameters.Add(p );
}
....//do something
dbcmd.SetParame ter("@pending_i d",iCredId);
....//dosomething
dbcmd.Command.P arameters.Clear ();
dbcmd.Dispose() ;
dbcmd = null;

In some cased the above is wrapped in a for() loop and other times the
method is simply called a second time.

The first step through is fine, but then subsequent runs generates the error
in the subject, so I did this...

foreach(SqlPara meter p in params){
if(!dbcmd.Comma nd.Parameters.C ontains(p.Param eterName)){
dbcmd.Command.P arameters.Add(p );}
}
....//do something
dbcmd.SetParame ter("@pending_i d",iCredId); //Enterprise Library
DBCommandWrappe r method
....//dosomething
dbcmd.Command.P arameters.Clear ();
dbcmd.Dispose() ;
dbcmd = null;

this generated an error at the SetParameter() line that indicated that
"@pending_i d" was not part of the parameter collection

So I got real smart and tried this....

foreach(SqlPara meter p in params){
try{
dbcmd.Command.P arameters.Add(p );}
catch{}
}
....//do something
dbcmd.SetParame ter("@pending_i d",iCredId);
....//dosomething
dbcmd.Command.P arameters.Clear ();
dbcmd.Dispose() ;
dbcmd = null;

....but I get the same message that @pending_id is not part of the parameter
collection.

Waiting patiently for help...