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Export DataTable to Excel with Formatting in C#

, 21 Nov 2014 CPOL 171.5K 7.1K 46
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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)

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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.
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Comments and Discussions

 
QuestionThank You so much.. I was in search of this in so many sites, but finally this one is working damn cool.. Pin
RazzSekhar11-May-15 23:18
memberRazzSekhar11-May-15 23:18 
GeneralMy vote of 1 Pin
nabati reza10-Feb-15 1:43
membernabati reza10-Feb-15 1:43 
Bugweak XML generation Pin
sx200826-Nov-14 17:28
membersx200826-Nov-14 17:28 
QuestionHow to create real Excel 2007 files (for free) Pin
Michael Gledhill25-Nov-14 0:36
memberMichael Gledhill25-Nov-14 0:36 
SuggestionExport real Excel file Pin
Ciprian Beldi22-Nov-14 10:05
memberCiprian Beldi22-Nov-14 10:05 
QuestionAs this code is only export to excel from datatable , but this code also using gridview for headers Pin
vivek123reddy19-Nov-14 20:07
membervivek123reddy19-Nov-14 20:07 
AnswerRe: As this code is only export to excel from datatable , but this code also using gridview for headers Pin
Santhosh Kumar Jayaraman19-Nov-14 20:26
memberSanthosh Kumar Jayaraman19-Nov-14 20:26 
QuestionThank you Pin
Mahsa Hassankashi15-Sep-14 12:05
memberMahsa Hassankashi15-Sep-14 12:05 
AnswerRe: Thank you Pin
Santhosh Kumar Jayaraman15-Sep-14 21:55
memberSanthosh Kumar Jayaraman15-Sep-14 21:55 
SuggestionAnother way to export data to Excel Pin
Member 860411026-Feb-14 20:53
memberMember 860411026-Feb-14 20:53 
QuestionFor thanks Pin
ram salunke13-Jan-14 23:51
memberram salunke13-Jan-14 23:51 
AnswerRe: For thanks Pin
Santhosh Kumar Jayaraman15-Sep-14 21:54
memberSanthosh Kumar Jayaraman15-Sep-14 21:54 
SuggestionMessage Automatically Removed Pin
6-Dec-13 6:34
membernilesh316-Dec-13 6:34 
GeneralNice Work Pin
T Pat8-Aug-13 3:26
professionalT Pat8-Aug-13 3:26 
GeneralGood Example Pin
pankulchitrav17-Jun-13 20:21
memberpankulchitrav17-Jun-13 20:21 
GeneralMy vote of 5 Pin
Juhi Paunikar9-Apr-13 2:07
memberJuhi Paunikar9-Apr-13 2:07 
QuestionHTML/Reflection Pin
ripside@gmail.com24-Feb-13 15:27
memberripside@gmail.com24-Feb-13 15:27 
QuestionHow to hide the columns in the export Pin
90006056673-Jan-13 3:50
member90006056673-Jan-13 3:50 
AnswerRe: How to hide the columns in the export Pin
ripside@gmail.com24-Feb-13 15:29
memberripside@gmail.com24-Feb-13 15:29 
GeneralMy vote of 3 Pin
arunk52531-Oct-12 20:54
memberarunk52531-Oct-12 20:54 
Suggestionthis is not a correct format of excel Pin
arunk52531-Oct-12 20:54
memberarunk52531-Oct-12 20:54 
GeneralMy vote of 5 Pin
jeetu.choudhary136-Oct-12 2:14
memberjeetu.choudhary136-Oct-12 2:14 
GeneralMy vote of 5 Pin
JavierS1-Oct-12 6:45
memberJavierS1-Oct-12 6:45 
Questioncorrect way of creating excel files Pin
Vahid_N20-Jun-12 4:16
memberVahid_N20-Jun-12 4:16 
Questionmy vote of 5 Pin
beleshi20-Jun-12 3:17
memberbeleshi20-Jun-12 3:17 

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