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public void AddRow(object[] objRowContent, ref StreamWriter swExcelFile)
        {
            //Begin row
            swExcelFile.WriteLine("<tr>");
            foreach (object obj in objRowContent)
            {
                if (obj == null)
                {
                    swExcelFile.WriteLine("<td>" + "</td>");
                }
                else
                { 
                  swExcelFile.WriteLine("<td>" + obj.ToString() + "</td>");
                }
            }
            //End row
            swExcelFile.WriteLine("</tr>");
        }					

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StreamWriter writeExcel = new StreamWriter("test.xls");
string[] test = new string[1];
test[0] = "Wert1";
test[1] = "Wert2";

AddRow(test,writeExcel);