Prevent newline when assinging to var?

Could you please specify the following:

• lenght of the first line of initial string (with spaces from left border of text editor included);
• ReSharper | Options | Code Editing | C# | Formatting Style | Line Breaks and Wrapping | Line wrapping | Line Wrapping | checked or unchecked;
• ReSharper | Options | Code Editing | C# | Formatting Style | Line Breaks and Wrapping | Line wrapping | Line Wrapping | Right margin (column) | the value of the setting?

In my real example (not the contrived one I posted), the length of the first line of the initial string of

        var thing = DoSomething()

is 113 characters (including left margin)

Line wrapping is checked

Right margin column value is 140

If i do the following

        var thing = DoSomething().ThenDoThisOtherThing()

Then the right column value (including all left leading whitespace) is only 124.  I want everything to break after the second method invocation and align to the dots.  Is that possible?

Thanks for the reply! Just forgot to ask about the status of ReSharper | Options | Code Editing | C# | Formatting Style | Line Breaks and Wrapping | Preserve existing formatting | Keep existing line breaks.