how to create .txt file and write it c# asp.net

Question

I am trying create and write to a text file in a C# application using the following code

System.IO.Directory.CreateDirectory(Server.MapPath("~\\count"));

using (System.IO.FileStream fs = new System.IO.FileStream("~/count/count.txt", System.IO.FileMode.Create))
using (System.IO.StreamWriter sw = new System.IO.StreamWriter("~/count/count.txt"))
{
    sw.Write("101");
}

string _count = System.IO.File.ReadAllText("~/count/count.txt");
Application["NoOfVisitors"] = _count;

but I get an error:

The process cannot access the file 'path' because it is being used by another process.

What is my error?

Danny Tuppeny · Accepted Answer · 2014-10-04 08:45:06Z

11

You're trying to open the file twice; your first using statements creates a FileStream that is not used, but locks the file, so the second using fails.

Just delete your first using line, and it should all work fine.

However, I'd recommend replacing all of that with File.WriteAllText, then there would be no using in your code, it'd be much simpler.

var dir = Server.MapPath("~\\count");
var file = Path.Combine(dir, "count.txt");

Directory.CreateDirectory(dir);
File.WriteAllText(file, "101");

var _count = File.ReadAllText(file);
Application["NoOfVisitors"] = _count;

edited Oct 4, 2014 at 8:45

answered Oct 4, 2014 at 7:33

Danny Tuppeny

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4 Comments

Happy .NET Over a year ago

i need to restart visual studio or system ?

Danny Tuppeny Over a year ago

Restarting you PC should definitely fix it (unless it's an earlier part of your app locking it), but otherwise it depends on exactly what has it locked.

Happy .NET Over a year ago

using (System.IO.StreamWriter sw = new System.IO.StreamWriter("~/count/count.txt")) { sw.Write("101"); }

Danny Tuppeny Over a year ago

Oh, I misread your code. See edited answer, you're trying to open the file twice, you don't need your first using line.

Code · Accepted Answer · 2020-08-12 05:49:43Z

private void ExportTextFile()
    {
        #region  This region Used For Private variable.
        string lblName = null;
        string lblACN = null;
        string lblIFSC = null;
        string lblBCode = null;
        string lblAdd1 = null;
        string lblAdd2 = null;
        string lblAdd3 = null;
        string lblMobileNo = null;
        string lblEmai = null;

        #endregion

        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "";
        Response.ContentType = "application/text";
        StringBuilder Rowbind = new StringBuilder();
        for (int i = 0; i < GrdAcc.Rows.Count; i++)
        {
            CheckBox Chk_Status = (CheckBox)GrdAcc.Rows[i].FindControl

("ChkStatus");
            Label lbl_Status = (Label)GrdAcc.Rows[i].FindControl

("lblStatus");
            Label lbl_Code = (Label)GrdAcc.Rows[i].FindControl

("lblEmpCode");
            if (Chk_Status.Checked == true)
            {
                #region Fetching ACC Details From Database.
                AccPL.Status = lbl_Status.Text;
               AccPL.EmpCode = lbl_Code.Text;
                DataTable dt = AccBL.ExportFileAcc(AccPL);
                if (dt.Rows.Count > 0)
                {
                    lblName = dt.Rows[0]["Name"].ToString().Trim();
                    lblACNo = dt.Rows[0]["ACNo"].ToString().Trim();
                    lblBCode = dt.Rows[0]["BCode"].ToString().Trim();
                    lblIFSC = dt.Rows[0]["IFSC"].ToString().Trim();
                    lblAdd1 = dt.Rows[0]["ADd1"].ToString() + dt.Rows[0]

["PPostTehsil"].ToString();
                    lblAdd2 = dt.Rows[0]["Add2"].ToString().Trim() + 

dt.Rows[0]["PPIN"].ToString().Trim();
                    lblAdd3 = dt.Rows[0]["Add3"].ToString() + dt.Rows[0]

["State"].ToString().Trim();
                    lblMobileNo = dt.Rows[0]["MobileNo"].ToString().Trim();
                    lblEmai = dt.Rows[0]["Email"].ToString().Trim();

                }
                #endregion

                #region Generating Text File .
                if (ddlExportType.SelectedValue == "2")
                {

                    Response.AddHeader("content-disposition", " 

attachment;filename=" + DateTime.Now.ToString("ddMMyyhhmmss") + ".txt");
                    Rowbind.Append(lblName + "#" + lblAccNo + "#" + lblIFSC 

+ "#" + "#" + "#" + "#" + "#" + "#" + lbl_Code.Text);


                    Rowbind.Append("\r\n");
                }
                #endregion

               
        Response.Output.Write(Rowbind.ToString());
        Response.Flush();
        Response.End();

    }

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