How to execute a function with parameters in dapper

Question

Hi Guys 

 

Please assist executing a dapper function below. I am using oracle Below query complains that its missing a FROM, but when from is added, it complains that the query is missing expression.

var results = connection.Query("select from checkpin(:Username, :Password)", new { Username = input.Username, Password = input.Password }, commandType: CommandType.Text);