how to close File Stream in C#

Question

Please see this code.

string name = dt.Rows[0]["Name"].ToString();
byte[] documentBytes = (byte[])dt.Rows[0]["DocumentContent"];

int readBytes = 0;
//int index = 0;
readBytes = documentBytes.Length;
try
{
    using (FileStream fs = new FileStream(name, FileMode.Create, FileAccess.Write, FileShare.Read))
    {

        fs.Write(documentBytes, 0, readBytes);
        //System.Diagnostics.Process prc = new System.Diagnostics.Process();
        //prc.StartInfo.FileName = fs.Name;
        Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();
        app.Visible = false;
        Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Open(fs.Name);
        Microsoft.Office.Interop.Excel._Worksheet worksheet = (Excel.Worksheet)workbook.Sheets[1]; // Explicit cast is not required here
     //   lastRow = worksheet.Cells.SpecialCells(Excel.XlCellType.xlCellTypeLastCell).Row; 

        app.Visible = true;


        fs.Flush();
        fs.Close();
    }
}
catch (Exception ex)
{
    MessageBox.Show("You have clicked more than one time. File is already open.", "WorkFlow", MessageBoxButtons.OK, MessageBoxIcon.Information);
}

I am opening an excel file using the file stream. Excel is showing up nicely. But I am not able to close file stream. It still comes with a small pop up that shows 'File Now available'. How to get rid of that? I can see fs.Close() and Flush() really not working here. Please help.

Answer 1

You're asking Excel to open the file while you still have the stream open. Given that you're just trying to write bytes to it, I'd just use:

// This will close the file handle after writing the data
File.WriteAllBytes(name, documentBytes);

// Then you're fine to get Excel to open it
var app = new Microsoft.Office.Interop.Excel.Application();
app.Visible = false;
var workbook = app.Workbooks.Open(name);