Indicar que :AlgumaCoisa não é um parâmetro

You can suppress the automatic generation of parameter objects in response to changing the query text by setting the ParamCheck property to False. This is useful for data definition language (DDL) statements that contain parameters as part of the DDL statement that are not parameters for the query itself. For example, the DDL statement to create a stored procedure may define parameters that are part of the stored procedure. By setting ParamCheck to False, you prevent these parameters from being mistaken for parameters of the query.