Question

I want to read to my WEBApplication excel file,
I found a way to do it with connection string the problem is that i don’t spouse to know the work sheet amount and names. moreover, i want to use this names in DropDownList to give the user the ability to choose one.

Answer 1

If in your project you set a reference to assembly Microsoft.Office.Interop.Excel you can read your Excel file and use all functions you need.

EDITED after user comment:

public void Read(string filename)
{
    Excel.Application excel = new Excel.Application();
    Excel.Workbook wb = excel.Workbooks.Open(filename);

    // Get worksheet names
    foreach (Excel.Worksheet sh in wb.Worksheets)
        Debug.WriteLine(sh.Name);

    // Get values from sheets SH1 and SH3 (in my file)
    object val1 = wb.Sheets["SH1"].Cells[1, "A"].Value2;
    object val3 = wb.Sheets["SH3"].Cells[1, "A"].Value2;
    Debug.WriteLine("{0} / {1}", val1, val3);

    wb.Close();
    excel.Quit();
}