ejecutar Store Procedure con parametros

[kotayk]

Bueno ya hice andar el analyzer.
Ahora tengo el problema de ASP. Estoy probando de 2 maneras que son las siguientes:

Manera 1:
Set oConn = Server.CreateObject("ADODB.Connection")
oConn.Open "Driver={SQL Server};server=BCSM_PBCLI;Database=Web;uid=v904720 ;pwd=mariapaola"
Set cmd = Server.CreateObject ("ADODB.Command")
Set cmd.ActiveConnection = oConn
cmd.CommandText = "BuscarUsuario"
cmd.CommandType = adCmdStoredProc
cmd.Parameters.Append cmd.CreateParameter("web_user",adVarChar,adParamIn put,50)
cmd.Parameters.Append cmd.CreateParameter("web_pswd",adVarChar,adParamIn put,100)
cmd("web_user")=user ---> user lo recibo del form
cmd("web_pswd")=pass ---> user lo recibo del form

Manera 2:
Set oConn = Server.CreateObject("ADODB.Connection")
oConn.Open "Driver={SQL Server};server=BCSM_PBCLI;Database=Web;uid=v904720 ;pwd=mariapaola"
Set cmd = Server.CreateObject ("ADODB.Command")
Set cmd.ActiveConnection = oConn
cmd.CommandText = "BuscarUsuario"
cmd.CommandType = adCmdStoredProc
cmd.Parameters.Refresh
cmd.Parameters(0)=user
cmd.Parameters(1)=pass

El ERROR es el siguiente:
ADODB.Command error '800a0bb9'
Arguments are of the wrong type, are out of acceptable range, or are in conflict with one another.