Json result format in mvc - asp.net-mvc

Question

I want to read the text file into json. i have a text file with three lines.
While i tried to read using json .It returns all the 3 lines into one string.
Here is my code for your reference :
[System.Web.Mvc.HttpPost]
public JsonResult upload(HttpPostedFileBase file)
{
bool result = false;
StringBuilder strbuild = new StringBuilder();
try
{
if (file.ContentLength == 0)
throw new Exception("Zero length file!");
else
{
var fileName = Path.GetFileName(file.FileName);
var filePath = Path.Combine(Server.MapPath("~/Downloads"), fileName);
file.SaveAs(filePath);
if (!string.IsNullOrEmpty(filePath))
{
using (StreamReader sr = new StreamReader(Path.Combine(Server.MapPath("~/Downloads"), fileName)))
{
while (sr.Peek() >= 0)
{
strbuild.AppendFormat(sr.ReadLine());
}
}
}
}
}
catch (Exception)
{
result = false;
}
return new JsonResult()
{
Data = strbuild.ToString()
};
}
My Result is :
"HD-M-16-H-000001*1001*1 HD-M-16-H-000001*1001 HD-M-16-H-000001 15 JUL 201614 JUL 20170816ACHEONG SIEW FUNG 12345678I 22 DEC 1960SPO F- 15 JUL 201615 JUL 2016 HD-M-16-H-000001*1001*2 HD-M-16-H-000001*1001 HD-M-16-H-000001 15 JUL 201614 JUL 20170816AREBECCA SIOW SIQIN S1234567E 04 FEB 1995C O F- 15 JUL 201615 JUL 2016 HD-M-16-H-000001*1001*3 HD-M-16-H-000001*1001 HD-M-16-H-000001 15 JUL 201614 JUL 20170816ASAMANTHA SIOW SIHUI S1234567J 18 NOV 1993C O F- 15 JUL 201615 JUL 2016 "
My Text File is :
line 1:
HD-M-16-H-000001*1001*1 HD-M-16-H-000001*1001 HD-M-16-H-000001 15 JUL 201614 JUL 20170816ACHEONG SIEW FUNG 12345678I 22 DEC 1960SPO F- 15 JUL 201615 JUL 2016
line 2 :
HD-M-16-H-000001*1001*2 HD-M-16-H-000001*1001 HD-M-16-H-000001 15 JUL 201614 JUL 20170816AREBECCA SIOW SIQIN S1234567E 04 FEB 1995C O F- 15 JUL 201615 JUL 2016
Line 3:
HD-M-16-H-000001*1001*3 HD-M-16-H-000001*1001 HD-M-16-H-000001 15 JUL 201614 JUL 20170816ASAMANTHA SIOW SIHUI S1234567J 18 NOV 1993C O F- 15 JUL 201615 JUL 2016
So how can i show the json result with 3 (String) lines ?
Thanks in advance !!!