Stored procedure or function expects parameter which was not supplied

Question

I am trying to insert data into a SQL Server database by calling a stored procedure, but I am getting the error

*Procedure or function \'Insertion\'

Answer 1

Same error message still these days scoping multiple problems - my issue was passing a null value to the parameter. The answer is to null check like so:

parameter.Value = (object)yourParamVal ?? DBNULL.Value;