Api calling from my mvc project by button click

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C#

my api is working from browser.when I hit form browser or fiddler then its working fine.
but when I hit from my mvc project by click a button then its not working.calling example......

HttpClient httpclient = new HttpClient();
httpclient.BaseAddress = new Uri("http://localhost:56315/api/index/get");

note:MyAPI Project is an another project and mvc is an another project.that means two separate project.

so please help me

What I have tried:

moreover I tried only assigned port number.like as below

HttpClient httpclient = new HttpClient();
httpclient.BaseAddress = new Uri("http://localhost:56315");