Delay response while converting Image?

Question

Hi everyone I have an issue I am making API on .net core when I call data in this there is filed image which return image path, I want to convert it into byte64, when I converted then there is a lot of time to give response below is my code. 

 

I want a response in no time,  

 

 

var data = await Task.Run(() => context.GetStoreProc.FromSqlRaw("EXECUTE dbo.Nstp_GetTeamBy_ID {0}", ManagerID).Select(x => new TeamManagerResponse
               {
                   DepartmentName = x.DepartmentName,
                   DesignationDesc = x.DesignationDesc,
                   EmailAdd = x.EmailAdd,
                   EmpImg = DataHelper.ConvertImageToByteArray(x.EmpImg),  // below is this method
                   EmpName = x.EmpName
               }).ToListAsync());
               return data;

 

public static string ConvertImageToByteArray(string Image_Path)
        {
            string imgPathFinal = "";
            var imgPath = System.Reflection.Assembly.GetEntryAssembly().Location;
            int location = imgPath.LastIndexOf("\\bin");
            imgPathFinal = imgPath.Substring(0, location) + Image_Path;
            byte[] imageByteArray = null;
            if (File.Exists(imgPathFinal))
            {
                //byte[] result = DataHelper.ConvertImageToByteArray(imgPathFinal);
                FileStream fileStream = new FileStream(imgPathFinal, FileMode.Open, FileAccess.Read);
                using (BinaryReader reader = new BinaryReader(fileStream))
                {
                    imageByteArray = new byte[reader.BaseStream.Length];
                    for (int i = 0; i < reader.BaseStream.Length; i++)
                        imageByteArray[i] = reader.ReadByte();
                }
                return Convert.ToBase64String(imageByteArray, 0, imageByteArray.Length);
            }
            else
            {
                return imgPathFinal;
            }

        }

 please help me