Question

I have a .Net-Windows application in C#. I need to open an excel and process it. How can I do this without using Microsoft.Office.Interop.Excel libraries?

Answer 1

var fileName = @"C:\ExcelFile.xlsx";
var connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties=\"Excel 12.0;IMEX=1;HDR=NO;TypeGuessRows=0;ImportMixedTypes=Text\""; ;
using (var conn = new OleDbConnection(connectionString))
{
    conn.Open();

    var sheets = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
    using (var cmd = conn.CreateCommand())
    {
        cmd.CommandText = "SELECT * FROM [" + sheets.Rows[0]["TABLE_NAME"].ToString() + "] ";

        var adapter = new OleDbDataAdapter(cmd);
        var ds = new DataSet();
        adapter.Fill(ds);
    }
}