Any idea why it is showing the process cannot access the file because it is being used by another process?

Question

1.00/5 (1 vote)

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 private void btnSaveSL_Click(object sender, EventArgs e)
        {
            string record = "";

            string path = txtFilePathSL.Text;

            StreamReader reader = new StreamReader(path);
            string line = reader.ReadToEnd();

            if (line.Contains(txtMemberIDSL.Text))
            {
                lblMessageSL.Text = "The Record exists" + "\n" + "Record is updated now";
                lblMessageSL.Visible = true;

                record += txtMemberIDSL.Text + "\t";
                record += txtFnameSL.Text + "\t";
                record += txtLnameSL.Text + "\t";
                record += txtDateSL.Text + "\t";
                record += txtClassesSL.Text + "\t";
                record += txtCostPerClassSL.Text + "\t";
                record += txtPaidSL.Text + "\t";
             
                    using (writer = new StreamWriter(@"c:\Myfile\studentsRecord.txt", append: false))
                    {
                        writer.WriteLine(record);
                    }
                               

            }
}

What I have tried:

I have tried tried file share didn't work

Posted 15-Jul-21 12:42pm

Mundane alfa

Updated 15-Jul-21 21:41pm

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2 solutions

Solution 1

I converted your code to run as a function in a console program and had no trouble. I suspect you are locking the file somewhere else in your program. I suggest you use Process Explorer to determine which process is holding the file.

Google

find the owner of a file using processexplorer

to see the following instructions:

Identify which handle or DLL is using a file

    Open Process Explorer. Running as administrator.
    Enter the keyboard shortcut Ctrl+F. ...
    A search dialog box will open.
    Type in the name of the locked file or other file of interest. ...
    Click the button "Search".
    A list will be generated.

You can download Process Explorer from many sources. For example:
Process Explorer - Windows Sysinternals | Microsoft Docs[^]

Posted 15-Jul-21 17:55pm

Roger500

Updated 15-Jul-21 21:36pm

v2

Comments

Mundane alfa 16-Jul-21 0:41am

I just tried it is still showing the same problem

Richard Deeming 16-Jul-21 3:37am

I've replaced your unofficial link for Process Explorer with the official Microsoft link, since many downloads from unofficial sites bundle unwanted extra software with their installers.

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Richard Deeming · Accepted Answer · 2021-07-15T21:41:00

At a guess, txtFilePathSL.Text contains "c:\Myfile\studentsRecord.txt"; you are trying to read from and write to the same file.

Your code opens a StreamReader for the path, but never closes it. You then try to open a StreamWriter to the same path, but the file is locked by your own code.

Change your code so that your StreamReader is closed before you try to write to the file:

C#

string line;
using (StreamReader reader = new StreamReader(path))
{
    line = reader.ReadToEnd();
}

Better yet, use the utility methods in the File class:

C#

string line = File.ReadAllText(path);