I generally use the code
_uri = Server.UrlEncode(_uri);
URLEncode returns a string in which all non-alphanumeric characters other than – (hyphen) _ (underscore), and . (period) have been replaced with a percent (%) sign followed by two hex digits that correspond to the charactor code and spaces encoded as plus (+) signs. Spaces can alternatively be encoded as %20. 20 is (16*2)+(1*0)=32 in decimal, which is the ASCII code for space.
If You write
then Result will come like this