Accessing an open Excel Workbook in C#

Question

I need to access an excel file that is already open. I thought just inspecting the .Workbooks property that it would be there but it isn\'t. What is the right w

Answer 1

 String constr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+txtSourceFile.Text+";Extended Properties='Excel 8.0;HDR=YES;';";
        String constr2 = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + txtLibrary.Text + ";Extended Properties='Excel 8.0;HDR=YES;';";

        OleDbConnection con = new OleDbConnection(constr);
        OleDbConnection con2 = new OleDbConnection(constr2);
        OleDbConnection con3 = new OleDbConnection(constr);

        OleDbCommand oconn = new OleDbCommand("Select * From [eudra$]", con);
        OleDbCommand oconn2 = new OleDbCommand("Select * From [Sheet1$]", con2);
        OleDbCommand oconn3 = new OleDbCommand("Select * From [eudra$] where EXAMPARM in ('with one or more serious adverse events','with one or more non-serious adverse events that met the incidence cutoff')", con);

        if (txtSourceFile.Text != "")
        {
            con.Open();
            con2.Open();
            con3.Open();

            OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
            OleDbDataAdapter sda2 = new OleDbDataAdapter(oconn2);
            OleDbDataAdapter sda3 = new OleDbDataAdapter(oconn3);


            DataTable data = new DataTable();
            sda.Fill(data);

            DataTable data2 = new DataTable();
            sda2.Fill(data2);

            DataTable data3 = new DataTable();
            sda3.Fill(data3);

            var test = JoinDataTables(data, data2, (row1, row2) => (row1.Field("BODY_SYS").ToUpper() == row2.Field("Term").ToUpper() ));

            data3.Merge(test, true);

            dgvImp.DataSource = data3;
            con.Close();
        }