Display image if the image url contains + symbol

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C#

string imagepath = @"photos\PRIUS+\5MM.jpg";
Img.ImageUrl = imagepath ;

Here I wanted set the image url, but path have + symbol. i.e folder name photos under that PRIUS+ is sub folder, 5MM.jpg is image to display.

Any help can be appreciated.

What I have tried:

I have tried allowDoubleEscaping="true" in web.config. But it opens the security whole. So not commanded. Any alternate way I can display the image?
<security>
<requestFiltering allowDoubleEscaping="true"/>


Can any one help me to fix this issue.