Export data to excel in C#

  namespace ExportExcel  
    {      
        public partial class ExportDatatabletoExcel : Form  
        {  
            public ExportDatatabletoExcel()  
            {  
                InitializeComponent();  
            }  

            private void Form1_Load(object sender, EventArgs e)
            {

                DataTable dt = new DataTable();

                //Add Datacolumn
                DataColumn workCol = dt.Columns.Add("FirstName", typeof(String));

                dt.Columns.Add("LastName", typeof(String));
                dt.Columns.Add("Blog", typeof(String));
                dt.Columns.Add("City", typeof(String));
                dt.Columns.Add("Country", typeof(String));

                //Add in the datarow
                DataRow newRow = dt.NewRow();

                newRow["firstname"] = "Arun";
                newRow["lastname"] = "Prakash";
                newRow["Blog"] = "http://royalarun.blogspot.com/";
                newRow["city"] = "Coimbatore";
                newRow["country"] = "India";

                dt.Rows.Add(newRow);

                //open file
                StreamWriter wr = new StreamWriter(@"D:\\Book1.xls");

                try
                {

                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        wr.Write(dt.Columns[i].ToString().ToUpper() + "\t");
                    }

                    wr.WriteLine();

                    //write rows to excel file
                    for (int i = 0; i < (dt.Rows.Count); i++)
                    {
                        for (int j = 0; j < dt.Columns.Count; j++)
                        {
                            if (dt.Rows[i][j] != null)
                            {
                                wr.Write(Convert.ToString(dt.Rows[i][j]) + "\t");
                            }
                            else
                            {
                                wr.Write("\t");
                            }
                        }
                        //go to next line
                        wr.WriteLine();
                    }
                    //close file
                    wr.Close();
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
        }
    }