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

For others : I just faced the same error because one of my parameters was null. We need to check for it such as :

command.Parameters.AddWithValue("@phone", (object)phone?? DBNull.Value);