Excel Repot From Data Table

Code for coverting Data table Execl Report

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Globalization;
using System.Reflection;

namespace Common
{
 /// <summary>
 /// Download Excel
 /// </summary>
 public class DownloadExcel : System.Web.UI.Page
 {

 #region Methods (4)

 // Public Methods (3)

 /// <summary>
 /// Generics the list to data table.
 /// </summary>
 /// <param name="list">The list.</param>
 /// <returns></returns>
 public static DataTable GenericListToDataTable(object list)
 {
 DataTable dt = null;
 Type listType = list.GetType();
 if (listType.IsGenericType)
 {
 //determine the underlying type the List<> contains
 Type elementType = listType.GetGenericArguments()[0];

 //create empty table -- give it a name in case
 //it needs to be serialized
 dt = new DataTable(elementType.Name + "List");

 //define the table -- add a column for each public
 //property or field
 MemberInfo[] miArray = elementType.GetMembers(
 BindingFlags.Public | BindingFlags.Instance);
 foreach (MemberInfo mi in miArray)
 {
 if (mi.MemberType == MemberTypes.Property)
 {
 PropertyInfo pi = mi as PropertyInfo;
 dt.Columns.Add(pi.Name);
 }
 else if (mi.MemberType == MemberTypes.Field)
 {
 FieldInfo fi = mi as FieldInfo;
 dt.Columns.Add(fi.Name, fi.FieldType);
 }
 }

 //populate the table
 IList il = list as IList;
 foreach (object record in il)
 {
 int i = 0;
 object[] fieldValues = new object[dt.Columns.Count];
 foreach (DataColumn c in dt.Columns)
 {
 MemberInfo mi = elementType.GetMember(c.ColumnName)[0];
 if (mi.MemberType == MemberTypes.Property)
 {
 PropertyInfo pi = mi as PropertyInfo;
 fieldValues[i] = pi.GetValue(record, null);
 }
 else if (mi.MemberType == MemberTypes.Field)
 {
 FieldInfo fi = mi as FieldInfo;
 fieldValues[i] = fi.GetValue(record);
 }
 i++;
 }
 dt.Rows.Add(fieldValues);
 }
 }
 return dt;
 }

 /// <summary>
 /// Gets the date from string.
 /// </summary>
 /// <param name="strDate">The STR date.</param>
 /// <returns></returns>
 public static DateTime GetDateFromString(string strDate)
 {
 DateTime dt;
 try
 {
 Int32 intOADate = Int32.Parse(strDate);
 dt = DateTime.FromOADate(intOADate);
 }
 catch
 {
 try //try with dd/MM/yyyy
 {
 IFormatProvider culture = new CultureInfo("fr-FR", true);
 dt = DateTime.Parse(strDate, culture);
 }
 catch //try with MM/dd/yyyy
 {
 IFormatProvider culture = new CultureInfo("en-US", false);
 dt = DateTime.Parse(strDate, culture);
 }
 }
 return dt;
 }

 /// <summary>
 /// Function to export grid data to excel
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <param name="entityList">The entity list.</param>
 /// <param name="hashTable">The hash table.</param>
 public void GetExcel<T>(List<T> entityList, Dictionary<int, string> hashTable) where T : class
 {

 ExportExcel(entityList, hashTable);

 }

 // Protected Methods (1)

 /// <summary>
 /// Exports the excel.
 /// </summary>
 /// <param name="entityList">The entity list.</param>
 /// <param name="hashTable">The hash table.</param>
 protected void ExportExcel(object entityList, Dictionary<int, string> hashTable)
 {

 DataTable dt = GenericListToDataTable(entityList);
 Response.Clear();
 Response.ClearContent();
 Response.ClearHeaders();
 Response.ContentType = "application/vnd.ms-excel";
 Response.AddHeader("Content-Disposition", "attachment; filename=Reports.xls");
 //Response.Clear();
 //Response.ContentType = "application/vnd.ms-excel";
 string sep = "";
 ICollection keyCollection = hashTable.Keys;
 int[] keys = new int[keyCollection.Count];
 keyCollection.CopyTo(keys, 0);
 for (int i = 0; i < dt.Columns.Count; i++)
 {

 Response.Write(sep + dt.Columns[i].ColumnName);
 sep = "\t";
 //excelTableColumn = excelTableColumn + "[" + hashTable[keys[i]] + "] text ,";
 }
 //foreach (DataColumn dc in dt.Columns)
 //{
 //    Response.Write(sep + dc.ColumnName);
 //    sep = "\t";
 //}
 Response.Write("\n");

 // int i;
 foreach (DataRow dr in dt.Rows)
 {
 sep = "";
 for (int i = 0; i < dt.Columns.Count; i++)
 {
 Response.Write(sep + dr[i].ToString());
 sep = "\t";
 }
 Response.Write("\n");
 }
 Response.End();

 }

 #endregion Methods

 }
}



The Above code you can be placed in common folder or App_code(freamwork 2.0)  when  you are creating report page
inherit this class to Report page like following code
/// <summary>
 ///
 /// </summary>
 public partial class DelayedVechiclesBodyTypeReport :  DownloadExcel
 {
 #region Private variables
//your code
 #endregion
 }


in Generate Report button Click write the following code :  
#region Web Generated Events
 /// <summary>
 ///
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 protected void btnGenerateReport_Click(object sender, EventArgs e)
 {
 List<ReportDelayedVehicleEntity> delayedVehicleDetailsList;
 delayedVehicleDetailsList = reportService.GetDelayVechiclesBodyTypeReport(Convert.ToInt32( rdoBodyType.SelectedValue));
 Dictionary<int, string> excelHashTable = new Dictionary<int, string>();
 excelHashTable.Add(0, "BodyNo");
 excelHashTable.Add(1, "ModelCode");
 excelHashTable.Add(2, "SuffixCode");
 excelHashTable.Add(3, "ColorCode");
 excelHashTable.Add(4, "JigInDate");
 excelHashTable.Add(5, "FrameNo");
 excelHashTable.Add(6, "ASSPlanned_LO");
 excelHashTable.Add(7, "EngineNo");
 excelHashTable.Add(8, "CurrentStageID");
 excelHashTable.Add(9, "CarFamily");
 excelHashTable.Add(10, "LotCode");
 excelHashTable.Add(11, "SpecSheetNumber");
 excelHashTable.Add(12, "EngineModelcode");
 excelHashTable.Add(13, "StageName");
 excelHashTable.Add(14, "StandardDefectName");
 excelHashTable.Add(15, "Remark");
 excelHashTable.Add(16, "DelayedDays");
 excelHashTable.Add(17, "RootResponsibilityName");
 excelHashTable.Add(18, "RepairResponsibilityName");
 excelHashTable.Add(19, "TargetDate");

 GetExcel(delayedVehicleDetailsList, excelHashTable);
 }

 #endregion

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