How can we pass an HTML table contents to a datagridview in C# windows application when table id not present ?

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C#

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How can we pass an html table contents to a datagridview in c# windows application when table id not present ?
Thanks in Advance

What I have tried:

webBrowser1.Url = new Uri("some page has table listing values");
           HtmlElement mytable = webBrowser1.Document.GetElementById("I have put class name here (table class name)");

           DataTable dtData = new DataTable();
           dtData.Columns.Add("column1");
           dtData.Columns.Add("column2");
           dtData.Columns.Add("column3");
           dtData.Columns.Add("column4");
           dtData.AcceptChanges();

           DataRow dr = null;

           foreach (HtmlElement row in mytable.GetElementsByTagName("tr"))
           {
               dr = dtData.NewRow();
               HtmlElementCollection cells = row.GetElementsByTagName("td");
               for (int i = 0; i < cells.Count; i++)
               {
                   dr[i] = cells[i].InnerText;
               }
               dtData.Rows.Add(dr);
           }
           dtData.AcceptChanges();

           dataGridView1.DataSource = dtData;
       }