je mi líto ale nejde to, nebo nevím jak s tím pracovat:

        String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
            "Data Source=" + Server.MapPath("data.xls") + ";" +
            "Extended Properties=Excel 8.0;";

        OleDbConnection objConn = new OleDbConnection(sConnectionString);

        
        objConn.Open();

        // OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM [List1$]", objConn);

        OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM [List1$A1:A1]", objConn);
        object hodnota = objCmdSelect.ExecuteScalar();

        
        OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();

        objAdapter1.SelectCommand = objCmdSelect;

        DataSet objDataset1 = new DataSet();

        objAdapter1.Fill(objDataset1, "XLData");
        GridView1.DataSource = objDataset1.Tables[0].DefaultView;
        GridView1.DataBind();

        objConn.Close();