dynamically change Navbar Color

Question

Navbar color changing in one page but changed color not displaying in all pages only default color is displaying in all pages. Navbar is in master page only. we are using dropdownlist option to change the color.

 

Default page

 

after changing the color 

 

 

ERROR: when we redirecting to another page navbar color changed to default color(purple) As Per  the requirement the navbar color should be same as the drop-down menu  selected color

 

 

Give any solutions or link to fix this issues

Thanks in Advance