how to check file exists in folder and replace the new one

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My code as follows

that excel old file has to be deleted and new file has to be replace automatically.

C#

private void Preseaintake()
{
    try
    {
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = con;
        cmd.CommandText = "Presea_Intakerpts '" + dtfromdate.Text.Trim() + "', '" + dttodate.Text.Trim() + "'";
        SqlDataAdapter adp = new SqlDataAdapter(cmd);
        DataTable table = new DataTable();
        adp.Fill(table);

        Microsoft.Office.Interop.Excel.Application xlapp = new Microsoft.Office.Interop.Excel.Application();
        Microsoft.Office.Interop.Excel.Workbook xlWorkBook;
        Microsoft.Office.Interop.Excel.Worksheet xlsheet;
        object misvalue = System.Reflection.Missing.Value;
       
        xlWorkBook = (Microsoft.Office.Interop.Excel.Workbook)xlapp.Workbooks.Add(1);
        xlsheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkBook.ActiveSheet;

        for (int i = 0; i < table.Columns.Count; i++)
        {
            xlsheet.Cells[1, i + 1] = table.Columns[i].ColumnName;

        }
        for (int i = 0; i < table.Rows.Count; i++)
        {
            for (int j = 0; j < table.Columns.Count; j++)
            {
                xlsheet.Cells[i + 2, j + 1] = table.Rows[i][j].ToString().Trim();
            }
        }

        xlWorkBook.SaveAs(Application.StartupPath + "\\Preseaintake\\newtest.xls", misvalue, misvalue, misvalue, misvalue, misvalue, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, misvalue, misvalue,
                 misvalue, misvalue, misvalue);
        xlWorkBook.Close(true, misvalue, misvalue);
        xlsheet = null;
        xlapp = null;
    }

    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK);
        return;
    }

}



private void sendmail()
{
    try
    {
        MailMessage mis = new MailMessage(); 
        SmtpClient smtpserver = new SmtpClient("smtp.gmail.com");
        smtpserver.Credentials = new NetworkCredential("reply@gmail.com", "hdfdf");
        smtpserver.Host = "smtp.gmail.com";
        smtpserver.Port = 587;
        smtpserver.EnableSsl = true;
        mis.From = new MailAddress("reply@gmail.com", "PreseaIntakeDetails");
        mis.IsBodyHtml = true;
        mis.To.Add("gdf@gmail.com");
        mis.Subject = "PreseaIntake Report";

        System.Net.Mail.Attachment attachment;
         attachment = new System.Net.Mail.Attachment(Application.StartupPath +               "\\Preseaintake\\newtest.xls");
        mis.Attachments.Add(attachment);
        smtpserver.Send(mis);
        mis.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
    }

    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK);
        return;
    }
}

i want to delete the old file and replace with new one.

for that how can i do?

in my above code what changes i have to made.

please help me.

regards,
narasiman P.

Posted 14-Mar-14 2:37am

Member 8054539

Updated 14-Mar-14 2:40am

Maarten Kools

v2

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3 solutions

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Maarten Kools · Answer 1 · 2014-03-14T02:44:00

Solution 1

File.Exists[^] and File.Delete[^]

Answer at ASP.NET forums[^]
Answer at Stack Overflow[^]

Posted 14-Mar-14 2:44am

Maarten Kools

Comments

Sergey Alexandrovich Kryukov 14-Mar-14 9:44am

Correct, a 5; and I added my 2 cents in Solution 3.
—SA

Tejas Vaishnav 14-Mar-14 10:12am

it will be true when we are playing with System.IO.File, but when we are using Excel interop to create excel file then we need to explicitly check that, file is already exist at that place or not, if exists then delete it.

MAYANK GEETE · Answer 2 · 2014-03-14T03:21:00

DirectoryInfo dir_file = new DirectoryInfo(dirpath);
foreach (FileInfo fi in dir_file.GetFiles())
{
string filepath = "";
filepath = dir_file + "\\" + fi;

if (!File.Exists(filepath))
{

System.IO.FileInfo fi_del = new System.IO.FileInfo(filepath);
try
{
fi_del.Delete();
}
catch (System.IO.IOException e)
{
//Console.WriteLine(e.Message);
MessageBox.Show(e.Message);
}
}
}
may b this will help u

Tejas Vaishnav · Answer 3 · 2014-03-14T04:12:00

I think in your existing code please make this type of modification...

C#

string filePath = Application.StartupPath + "\\Preseaintake\\newtest.xls";
if(System.IO.File.Exists(filePath))
   System.IO.File.Delete(filePath)


xlWorkBook.SaveAs(filePath, misvalue, misvalue, misvalue, misvalue, misvalue, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, misvalue, misvalue,
               misvalue, misvalue, misvalue);
      xlWorkBook.Close(true, misvalue, misvalue);
      xlsheet = null;
      xlapp = null;

how to check file exists in folder and replace the new one

3 solutions

Solution 1

Solution 2

Solution 4

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