How to read particular text in text file using c# .net?

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Hello,

Some Text written in my text file:-

ABC Licence Version 1.0
Validated Days=10
MAC Address=xxxxxxxxxxxx

How to read particular text in text file using c# .net?

I have to read only this text xxxxxxxxxxxx on button click event.

Please help me.

Thanks in Advance.

Ankit Agarwal
Software Engineer

Posted 8-Apr-14 23:56pm

ankit.agg1984

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Er. Puneet Goel · Answer 1 · 2014-04-09T00:05:00

Solution 1

Suppose your file is at dekstop with name test.txt

C#

System.IO.StreamReader streamReader = new System.IO.StreamReader("C:\\Users\\PuneetGoel\\Desktop\\test.txt");
        string text = streamReader.ReadToEnd();
        string macAddress = text.Split('=')[2].ToString();
        streamReader.Close();

Posted 9-Apr-14 0:05am

Er. Puneet Goel

Comments

[no name] 9-Apr-14 6:20am

I have problem with this code.
during compare system macAddress.
When i debugging our program so, it displayed in a label "xxxxxxxxxxxx\r\n\r\n\r\n" my macAddress it's not comparing.
Please help me.

Er. Puneet Goel 9-Apr-14 6:24am

This depend on what you have saved in the text file. In my text.txt i have saved the folowing lines.
ABC Licence Version 1.0
Validated Days=10
MAC Address=xxxxxxxxxxxx

So if you have something other that this, let me know. Coz this text is very important to be same.

[no name] 9-Apr-14 6:30am

I am displaying mac address in a label,
It's showing xxxxxxxxxxxx in label but when i compare this macAddress with original system mac addres so, now it,s having problem.
It's not matching my original mac address.

[no name] 9-Apr-14 6:32am

I am using this code for create text file.

FileStream fs1 = new FileStream("D:\\Licence.DAT", FileMode.OpenOrCreate, FileAccess.Write);
StreamWriter writer = new StreamWriter(fs1);
writer.Write("ABC Licence Version 1.0");
writer.Write("\n" + "Validated Days=" + "" + txtValidatedDays.Text);
writer.WriteLine("\n" + "MAC Address=" + "" + txtMacAddress.Text);
writer.Close();

Er. Puneet Goel 9-Apr-14 6:39am

Use This:

System.IO.StreamReader streamReader = new System.IO.StreamReader("D:\\Licence.DAT");
string text = streamReader.ReadToEnd();
string macAddress = text.Split('=')[2].ToString();
macAddress = macAddress.Substring(0, 13);
streamReader.Close();

Note: 0, 13 means mac address length is 14(12 + 2) digit
exp: 0123.4567.89ab

[no name] 9-Apr-14 7:00am

ECA86B93DA49\r
it's displaying

Er. Puneet Goel 9-Apr-14 7:04am

Ok got it,try this

System.IO.StreamReader streamReader = new System.IO.StreamReader("D:\\Licence.DAT");
string text = streamReader.ReadToEnd();
string macAddress = text.Split('=')[2].ToString();
string replacement = Regex.Replace(macAddress, @"\t|\n|\r", "");
streamReader.Close();

[no name] 9-Apr-14 7:14am

Thanks buddy.
It's working now.

Er. Puneet Goel 9-Apr-14 7:17am

all the best, please accept the solution in case you are happy.