How to show method parameter tooltip in C#?

Question

Ctrl+Shift+Space will do what you want.

You might want to check out a poster of key bindings.

It's Ctrl-K Ctrl-I for VS2015. In case people from the future are wondering wandering.

I don't understand what you mean exactly. But I use this coding for method parameters tooltip.

/// <summary>
/// Do work function
/// </summary>
/// <param name="id">This is user's Id.</param>
/// <param name="name">This is user's Name.</param>
/// <param name="surname">This is user's surname. </param>
private void DoWork(int id, string name, string surname)
{ 
    // do stuff
}

Ctrl + K, Ctrl + P

Worked for me where Ctrl + Shift + Space didn't. Perhaps due to Resharper?

Visual Studio 2019 with VsVim extension

Works both in NORMAL and INSERT modes, for C# and C++ with:

Ctrl+Shift+Space

Just make sure to place the caret right after the first parenthesis:

C#

"Value".Contains(|   <-- caret

C++

glClearColor(|  <-- caret