Click here to Skip to main content
11,409,922 members (61,154 online)
Click here to Skip to main content

Export DataTable to Excel with Formatting in C#

, 21 Nov 2014 CPOL
Rate this:
Please Sign up or sign in to vote.
Export a DataTable to an Excel file and add format to the contents while writing the Excel file.

Introduction

In this tip, let us see how to export a DataTable to an Excel file and add format to the contents while writing the Excel file.

Step 1: Create a web application and add a class Student with properties as below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Reflection;

namespace ExportToExcelFromDataTable
{
    public partial class _Default : System.Web.UI.Page
    {
       protected void Page_Load(object sender, EventArgs e)
       {
       }
    }
    public class Student
    {
        public string Name { get; set; }
        public int StudentId { get; set; }
        public int Age { get; set; }
    }
}

Step 2: I have added Gridview_Result. Create a list for students in the page_load event. Add a property dt of type DataTable. Bind the DataTable to the GridView after converting the List to a DataTable. The conversion class is described in the next step.

protected void Page_Load(object sender, EventArgs e)
{
    List<Student> Students = new List<Student>(){
        new Student() { Name = "Jack", Age = 15, StudentId = 100 },
        new Student() { Name = "Smith", Age = 15, StudentId = 101 },           
        new Student() { Name = "Smit", Age = 15, StudentId = 102 }
    };
    ListtoDataTableConverter converter = new ListtoDataTableConverter();
    dt = converter.ToDataTable(Students);
    GridView_Result.DataSource = Students;
    GridView_Result.DataBind();
}

Step 3: Now we are going to convert this List object to a DataTable. For that we need to create a new class and a conversion method as below.

public class ListtoDataTableConverter
{
    public DataTable ToDataTable<T>(List<T> items)
    {
        DataTable dataTable = new DataTable(typeof(T).Name);
        //Get all the properties
        PropertyInfo[] Props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
        foreach (PropertyInfo prop in Props)
        {
            //Setting column names as Property names
            dataTable.Columns.Add(prop.Name);
        }

         foreach (T item in items)
        {
            var values = new object[Props.Length];
            for (int i = 0; i < Props.Length; i++)
            {
                //inserting property values to datatable rows
                values[i] = Props[i].GetValue(item, null);
            }

            dataTable.Rows.Add(values);

        }
         //put a breakpoint here and check datatable
        return dataTable;
    }
}

The above method will set the property name as a column name for the DataTable and for each object in the list; it will create a new row in the DataTable and insert values. 

Step 4: I have written the below method which will convert a DataTable to an Excel file. In this method, I added font, made headers bold, and added a border. You can customize the method as per your needs.

private void ExporttoExcel(DataTable table)
{
    HttpContext.Current.Response.Clear();
    HttpContext.Current.Response.ClearContent();
    HttpContext.Current.Response.ClearHeaders();
    HttpContext.Current.Response.Buffer = true;
    HttpContext.Current.Response.ContentType = "application/ms-excel";
    HttpContext.Current.Response.Write(@"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">");
    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=Reports.xls");
   
    HttpContext.Current.Response.Charset = "utf-8";
    HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250");
      //sets font
    HttpContext.Current.Response.Write("<font style='font-size:10.0pt; font-family:Calibri;'>");
    HttpContext.Current.Response.Write("<BR><BR><BR>");
    //sets the table border, cell spacing, border color, font of the text, background, foreground, font height
    HttpContext.Current.Response.Write("<Table border='1' bgColor='#ffffff' " + 
      "borderColor='#000000' cellSpacing='0' cellPadding='0' " + 
      "style='font-size:10.0pt; font-family:Calibri; background:white;'> <TR>");
    //am getting my grid's column headers
    int columnscount = GridView_Result.Columns.Count;

    for (int j = 0; j < columnscount; j++)
    {      //write in new column
        HttpContext.Current.Response.Write("<Td>");
        //Get column headers  and make it as bold in excel columns
        HttpContext.Current.Response.Write("<B>");
        HttpContext.Current.Response.Write(GridView_Result.Columns[j].HeaderText.ToString());
        HttpContext.Current.Response.Write("</B>");
        HttpContext.Current.Response.Write("</Td>");
    }
    HttpContext.Current.Response.Write("</TR>");
    foreach (DataRow row in table.Rows)
    {//write in new row
        HttpContext.Current.Response.Write("<TR>");
        for (int i = 0; i < table.Columns.Count; i++)
        {
            HttpContext.Current.Response.Write("<Td>");
            HttpContext.Current.Response.Write(row[i].ToString());
            HttpContext.Current.Response.Write("</Td>");
        }

        HttpContext.Current.Response.Write("</TR>");
    }
    HttpContext.Current.Response.Write("</Table>");
    HttpContext.Current.Response.Write("</font>");
    HttpContext.Current.Response.Flush();
    HttpContext.Current.Response.End();
}

Step 4: Add a button and in the button click event, call the above method by passing a parameter.

protected void Btn_Export_Click(object sender, EventArgs e)
{
    ExporttoExcel(dt);
}

For the complete source code, please find the attached solution.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

Santhosh Kumar Jayaraman
Software Developer Radiometer
India India
Currently i am trying to learn all about javascripts . I have experience in Microsoft technologies like WPF, WCF, ASPNET, WinForms,Silverlight, VB.NET, C-Sharp, Entity framework,SSRS, LINQ, Extension methods and SQL server. I started with my career in Infosys in the year 2009 and i worked with Trigent, Education First (EF) in the recent years before joining my current company Radiometer.
Follow on   Twitter   LinkedIn

Comments and Discussions

 
GeneralMy vote of 1 Pinmembernabati reza10-Feb-15 1:43 
Bugweak XML generation Pinmembersx200826-Nov-14 17:28 
QuestionHow to create real Excel 2007 files (for free) PinmemberMichael Gledhill25-Nov-14 0:36 
SuggestionExport real Excel file PinmemberCiprian Beldi22-Nov-14 10:05 
QuestionAs this code is only export to excel from datatable , but this code also using gridview for headers Pinmembervivek123reddy19-Nov-14 20:07 
AnswerRe: As this code is only export to excel from datatable , but this code also using gridview for headers PinmemberSanthosh Kumar Jayaraman19-Nov-14 20:26 
QuestionThank you PinmemberMahsa Hassankashi15-Sep-14 12:05 
AnswerRe: Thank you PinmemberSanthosh Kumar Jayaraman15-Sep-14 21:55 
SuggestionAnother way to export data to Excel PinmemberMember 860411026-Feb-14 20:53 
QuestionFor thanks Pinmemberram salunke13-Jan-14 23:51 
AnswerRe: For thanks PinmemberSanthosh Kumar Jayaraman15-Sep-14 21:54 
SuggestionMessage Automatically Removed Pinmembernilesh316-Dec-13 6:34 
GeneralNice Work PinprofessionalT Pat8-Aug-13 3:26 
GeneralGood Example Pinmemberpankulchitrav17-Jun-13 20:21 
GeneralMy vote of 5 PinmemberJuhi Paunikar9-Apr-13 2:07 
QuestionHTML/Reflection Pinmemberripside@gmail.com24-Feb-13 15:27 
QuestionHow to hide the columns in the export Pinmember90006056673-Jan-13 3:50 
AnswerRe: How to hide the columns in the export Pinmemberripside@gmail.com24-Feb-13 15:29 
GeneralMy vote of 3 Pinmemberarunk52531-Oct-12 20:54 
Suggestionthis is not a correct format of excel Pinmemberarunk52531-Oct-12 20:54 
GeneralMy vote of 5 Pinmemberjeetu.choudhary136-Oct-12 2:14 
GeneralMy vote of 5 PinmemberJavierS1-Oct-12 6:45 
Questioncorrect way of creating excel files PinmemberVahid_N20-Jun-12 4:16 
Questionmy vote of 5 Pinmemberbeleshi20-Jun-12 3:17 
AnswerRe: my vote of 5 Pinmemberrohandm2924-Aug-12 3:15 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.150414.5 | Last Updated 21 Nov 2014
Article Copyright 2012 by Santhosh Kumar Jayaraman
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid