Most Effective Way of Exporting DataTable to Excel

How to Export DataTable to Excel using c#

As you know Export data as Excel file in C# is one of the most used functionality in the applications. So here, I am going to sharing how to Export data as Excel using C#.

Following is simple c# code that export data as Excel

     
     public void ExportToExcel()

        {

            //Fetching user records with GetUserDetails method.

            /// Here you can write your own code to fetch recodes as per you DB connections.

            var UserList = repositoryUser.GetUserDetails();

            DataTable dt = new DataTable();

            dt.Columns.AddRange(new DataColumn[5] { new DataColumn("ID", typeof(long)),

            new DataColumn("Name", typeof(string)),

            new DataColumn("Age", typeof(int)),

            new DataColumn("Address", typeof(string)),

            new DataColumn("DOB", typeof(string)),

            });

            foreach (var x in UserList)

            {

                dt.Rows.Add(x.ID, x.Name, x.Age, x.Address, x.DOB);

            }

            GridView GridView1 = new GridView();

            GridView1.AllowPaging = false;

            GridView1.DataSource = dt;

            GridView1.DataBind();

            Response.Clear();

            Response.Buffer = true;

            Response.AddHeader("content-disposition", "attachment;filename=User.xls");

            Response.Charset = "";

            Response.ContentType = "application/vnd.ms-excel";

            StringWriter sw = new StringWriter();

            HtmlTextWriter hw = new HtmlTextWriter(sw);

            for (int i = 0; i < GridView1.Rows.Count; i++)

            {

                //adding class text style to each Row

                GridView1.Rows[i].Attributes.Add("class", "rowcss");

            }

            GridView1.RenderControl(hw);

            //Apply style to format numbers to string

            string style = @"<style>.rowcss { mso-number-format:\@; } </style>";

            Response.Write(style);

            Response.Output.Write(sw.ToString());

            Response.Flush();

            Response.End();

           

        }

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