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Export DataTable to Excel with Formatting in C#

By , 20 Jun 2012
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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)

About the Author

Santhosh Kumar Jayaraman
Software Developer Education First
India India
Started my career with Infosys in 2009 and currently working with Education First. I have great passion towards Microsoft technologies. 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.

Comments and Discussions

 
SuggestionAnother way to export data to Excel PinmemberMember 860411026-Feb-14 19:53 
QuestionFor thanks Pinmemberram salunke13-Jan-14 22:51 
SuggestionExport usinng open xmk Pinmembernilesh316-Dec-13 5:34 
GeneralNice Work PinprofessionalT Pat8-Aug-13 2:26 
GeneralGood Example Pinmemberpankulchitrav17-Jun-13 19:21 
GeneralMy vote of 5 PinmemberJuhi Paunikar9-Apr-13 1:07 
QuestionHTML/Reflection Pinmemberripside@gmail.com24-Feb-13 14:27 
QuestionHow to hide the columns in the export Pinmember90006056673-Jan-13 2:50 
AnswerRe: How to hide the columns in the export Pinmemberripside@gmail.com24-Feb-13 14:29 
GeneralMy vote of 3 Pinmemberarunk52531-Oct-12 19:54 
Suggestionthis is not a correct format of excel Pinmemberarunk52531-Oct-12 19:54 
GeneralMy vote of 5 Pinmemberjeetu.choudhary136-Oct-12 1:14 
GeneralMy vote of 5 PinmemberJavierS1-Oct-12 5:45 
Questioncorrect way of creating excel files PinmemberVahid_N20-Jun-12 3:16 
Questionmy vote of 5 Pinmemberbeleshi20-Jun-12 2:17 
AnswerRe: my vote of 5 Pinmemberrohandm2924-Aug-12 2:15 
AnswerRe: my vote of 5 PinmemberSanthosh Kumar J5-Sep-12 21:27 
QuestionThis should be a tip, not an article PinmemberClifford Nelson19-Jun-12 20:00 
AnswerRe: This should be a tip, not an article PinmemberSanthosh Kumar J5-Sep-12 21:27 

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