How to extract file path from text file if present using C#

Question

I have a text file with information:

Template PUC

C# Assignment.
Path=E:\Project_Excel.xlsx
Path= EMailId=[e-mail]; [e-mail]; [e-mail]

 

I am parsing the text file using C# and looking for "Path=" and extract the path after "=" and open it for further operation. If "Path=" has no path mentioned then it should ask user to enter the path manually on console window. Can anyone please help me where I am going wrong?

static void Main(string[] args)
        {
            try
            {
                string file = "E:\\Project_PU.txt";
                StreamReader sr = new StreamReader(file);
                String lines = sr.ReadToEnd();

                int x = lines.IndexOf('=');
                int y = lines.IndexOf('_');
                string x = lines.Substring(x + 1, y - x);


                string mail = File.ReadAllLines(file).FirstOrDefault(line => line.StartsWith("EmailId="));
                string sString = mail;
                string[] sLines = sString.Split(new string[] { "EmailId=", ";" }, StringSplitOptions.RemoveEmptyEntries);


                Excel.Application xlApp;
                Excel.Workbook xlWorkBook;
                Excel.Worksheet xlWorkSheet;
                Excel.Range range;

                long rowCount;
                long rw = 0;
                long cl = 0;

                xlApp = new Excel.Application();

                string path = "";
                Console.WriteLine();
                Console.WriteLine();


                if (File.Exists(path))
                {

                    xlWorkBook = xlApp.Workbooks.Open(path, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);