ORA-01036: illegal variable name/number when running query through C#

Question

I am trying to use ALTER USER query for Oracle database using OracleCommand in C# in the following code. It creates the query if the values for Username and pas

Answer 1

 cmd.Parameters.Add(new OracleParameter("GUSERID ", OracleType.VarChar)).Value = userId;

I was having eight parameters and one was with space at the end as shown in the above code for "GUSERID ".Removed the space and everything started working .