How to return bool value as true or false from web api ?

Question

I work on web api asp.net core 2.2

I face issue I can't return true or false from web api compare excel as below

so if excel is identical then return true else return false

[HttpGet]
[Route("CompareExcel")]
public IActionResult CompareExcel()
{          
    var DisplayFileName = Request.Form.Files[0];
    string fileName = DisplayFileName.FileName.Replace(".xlsx", "-") + Guid.NewGuid().ToString() + ".xlsx";
    string Month = DateTime.Now.Month.ToString();
    string DirectoryCreate = Path.Combine(myValue1, Month);// myValue1 + "\\" + Month + "\\" + fileName;
    CExcel ex = new CExcel();    
    string error = "";
    int rowCount = 0;  
    var filedata = ContentDispositionHeaderValue.Parse(Request.Form.Files[0].ContentDisposition).FileName.Trim('"');
    var dbPath = Path.Combine(DirectoryCreate, fileName);
    var InputfilePath = System.IO.Path.Combine(GetFilesDownload, "Gen.xlsx");
    using (var stream = new FileStream(dbPath, FileMode.Create))
    {
        Request.Form.Files[0].CopyTo(stream);
        stream.Flush();
        stream.Close();
    }
    GC.Collect();
    bool areIdentical = ex.CompareExcel(dbPath, InputfilePath, out rowCount, out error);
    if (areIdentical == true)
    {
        // return true
    }
    else
    {
        // return false
    }
}