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How to Generate Excel from JSON Data Using Asp.net(C#).

Here I will explain how to generate excel from json.
I am using NPOI and Newtonsoft.Json third party dll for this.

Download dll from here :  https://drive.google.com/file/d/0B2UW8NPznIKsdzJSWDBDX2xLSms/view

JSON For Test : [   {     "ID" : "1",     "NAME" : "Nikhil Sangani",     "MOBILENO" : "123456789",     "DESIGNATION" : "Web Developer"  } ]


First of all i am create aspx page design like this.


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
            <tr>
                <td>
                    JSON STRING :<asp:TextBox runat="server" ID="txtjsonstring"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:Button runat="server" ID="BtnExcel" Text="Excel" OnClick="BtnExcel_Click" />
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>


After that put this code on your code behind file.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using NPOI.SS.UserModel;
using System.Data;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using System.IO;
using Newtonsoft.Json;


namespace testProject
{
    public partial class WebForm1 : System.Web.UI.Page
    {    
        protected void Page_Load(object sender, EventArgs e)
        {       

        }

        public Workbook ExportToExcel(DataTable ExcelTable, string FileName)
        {
            DataTable dtTemp = new DataTable();

            for (int i = 0; i < ExcelTable.Columns.Count; i++)
            {
                dtTemp.Columns.Add(ExcelTable.Columns[i].ColumnName);
            }

            // Create a new workbook and a sheet name

            HSSFWorkbook workbook = new HSSFWorkbook();
            CreationHelper createHelper = workbook.GetCreationHelper();
            Sheet sheet = workbook.CreateSheet("Nikhil Sangani");          

            // Add header labels
            int rowIndex = 0;
            Row row = sheet.CreateRow(rowIndex);
            NPOI.SS.UserModel.Font Headerfont = workbook.CreateFont();
            Headerfont.FontName = "Arial";
            Headerfont.FontHeightInPoints = 10;
            Headerfont.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.BOLD;
          

            foreach (DataColumn column in dtTemp.Columns)
            {
                Cell headerCell = row.CreateCell(column.Ordinal);
                headerCell.SetCellValue(column.ColumnName);
                CellStyle headerCellStyle = workbook.CreateCellStyle();
                headerCellStyle.FillForegroundColor = HSSFColor.SKY_BLUE.index;
                headerCellStyle.FillPattern = FillPatternType.SOLID_FOREGROUND;
                headerCellStyle.Alignment = HorizontalAlignment.CENTER;
                headerCellStyle.SetFont(Headerfont);
                headerCellStyle.BorderBottom = CellBorderType.THIN;
                headerCellStyle.BottomBorderColor = HSSFColor.BLACK.index;
                headerCellStyle.BorderLeft = CellBorderType.THIN;
                headerCellStyle.LeftBorderColor = HSSFColor.BLACK.index;
                headerCellStyle.BorderRight = CellBorderType.THIN;
                headerCellStyle.RightBorderColor = HSSFColor.BLACK.index;
                headerCellStyle.BorderTop = CellBorderType.THIN;
                headerCellStyle.TopBorderColor = HSSFColor.BLACK.index;
                headerCell.CellStyle = headerCellStyle;
            }
            rowIndex++;


            NPOI.SS.UserModel.Font font = workbook.CreateFont();
            font.FontName = "Calibri";
            font.FontHeightInPoints = 9;

            CellStyle FontCellStyle = workbook.CreateCellStyle();
            FontCellStyle.SetFont(font);
            FontCellStyle.BorderBottom = CellBorderType.THIN;
            FontCellStyle.BottomBorderColor = HSSFColor.BLACK.index;
            FontCellStyle.BorderLeft = CellBorderType.THIN;
            FontCellStyle.LeftBorderColor = HSSFColor.BLACK.index;
            FontCellStyle.BorderRight = CellBorderType.THIN;
            FontCellStyle.RightBorderColor = HSSFColor.BLACK.index;
            FontCellStyle.BorderTop = CellBorderType.THIN;
            FontCellStyle.TopBorderColor = HSSFColor.BLACK.index;
          

            foreach (DataRow roww in ExcelTable.Rows)
            {
                row = (HSSFRow)sheet.CreateRow(rowIndex);
                foreach (DataColumn column in ExcelTable.Columns)
                {
                    row.CreateCell(column.Ordinal).SetCellValue(roww[column].ToString());
                }
                rowIndex++;
            }


            // Auto-size each column
            for (int i = 0; i < sheet.GetRow(0).LastCellNum; i++)
            {
                sheet.AutoSizeColumn(i);
            }

            for (int i = 1; i < sheet.LastRowNum - 5; i++)
            {
                for (int j = 0; j < sheet.GetRow(i).LastCellNum; j++)
                {
                    if (j != 0 && j != 1 && j != 2 && j != 3 && j != 4 && j != 5)
                    {
                        sheet.GetRow(i).GetCell(j).CellStyle = FontCellStyle;
                    }
                }
            }
            return workbook;
        }

        protected void BtnExcel_Click(object sender, EventArgs e)
        {

            Workbook workbook = new HSSFWorkbook();
            string FileName = "Nikhil" + "_" + DateTime.Today.ToString("dd_MM_yy").ToString() + "_" + DateTime.Now.ToString("hh_mm_ss").ToString() + ".xls";

     //Here convert JSON to DataTable.

            DataTable dtValue1 = (DataTable)JsonConvert.DeserializeObject(txtjsonstring.Text, (typeof(DataTable)));
            workbook = ExportToExcel(dtValue1, FileName);
            using (var exportData = new MemoryStream())
            {
                workbook.Write(exportData);
                string saveAsFileName = FileName;
                Response.ContentType = "application/vnd.ms-excel";
                Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", saveAsFileName));
                Response.Clear();
                Response.BinaryWrite(exportData.GetBuffer());
                Response.End();
            }
        }
    }
}




InPut: 



















Output :



































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