The connection file changes when I run the program

Multi tool use
The connection file changes when I run the program
file myProject.exe.config changed to another project connection string when I run project. (if rebuild project myProject.exe.config create Properly)
i run my project in bindebug, file myprojectname.exe.config change wrong
– Mahdi Jalali
Jun 30 at 7:36
file2.exe.config = "Test2Entity" when run project file2.exe.config change to "Test1Entity"
– Mahdi Jalali
Jun 30 at 7:37
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– Andrzej Ziółek
Jun 30 at 7:34