visual studio 2010 - vs C#2015 solution's backwards compatibility wont run on vs2010 even when nothing was done to it -

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so in middle of making program, when decided try upgrading vs2015 because newer ui.

so opened .sln in vs2015 test run program again, , re arrange ui of program, didnt add or remove anything, or touched code.

saved file, , tried opening again on laptop still on vs2010.

i can open solution,i can access , edit code, can't open designer @ all, or run program made.

although can upgrade 1 on laptop newer one, im doing project friend still on vs2010, there way make compatible again?

whenever try open project in visual studio 2015 developed in visual studio 2010 prompt window make changes in .sln file shows changes in browser.

if try open file changed vs2015 not able open in vs 2010 available open in vs 2012 , on word


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