What is the meaning of this statement in C#?

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I have developed a sample app on converting the doc to pdf file.
But I just want to know the meaning of this statement.

C#

object Unknown=Type.Missing;
 MSDOC.Documents.Open(ref Source, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown, ref Unknown,
                ref Unknown, ref Unknown);

Why do we write the "ref Unknown"? Please explain me.

Thanks in advance

Posted 11-Oct-10 20:51pm

hemantwithu

Updated 11-Oct-10 21:08pm

Sandeep Mewara

v2

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voloda2 · Accepted Answer · 2010-10-11T21:14:00

Solution 1

It means that you don't care about the value of parameter passed to the invoked COM method. In some languages can be those values missed.

In C# you must pass all of them.

Posted 11-Oct-10 21:14pm

voloda2

Comments

Toli Cuturicu 12-Oct-10 3:20am

In C# 4.0 you can miss them also.

voloda2 12-Oct-10 3:22am

Ok, thanks for clarification. But it's possible only with dynamic methods. Isn't it?