Exporting Dataset to Individual Excel Sheets (Windows Application)

In my previous article I wrote how to Export DataGridView Data to Excel in C# Without Saving to File System In this article, we will learn how to export a Dataset to individual Excel sheets in a C# Windows application.

1. Create a new project in Visual C# and select "Windows Forms Application" from the list of available templates and name your project "ExportDataSetToExcel".

Windows Forms Application

2. Now let us create two instances of DataTable.

Coding

DataTable 1 (Employee)

System.Data.DataTable table1 = new System.Data.DataTable("Employee");

table1.Columns.Add("EMPNO");

table1.Columns.Add("ENAME");

table1.Rows.Add("7786", "Vinoth");

table1.Rows.Add("8476", "Senthil");

table1.Rows.Add("1256", "Jayanth");

table1.Rows.Add("7896", "Ganesh");

table1.Rows.Add("4563", "Baskar");

table1.Rows.Add("7894", "Vimal");


DataTable 2 (Customer)

System.Data.DataTable table2 = new System.Data.DataTable("Customer");

table2.Columns.Add("CUSTID");

table2.Columns.Add("ITEMS");

table2.Rows.Add(1, "Gelusil");

table2.Rows.Add(1, "Amlong 4.5");

table2.Rows.Add(2, "Crocin");

table2.Rows.Add(3, "Strepsils");


3. Create a DataSet and put both tables in it using the Add method of DataSet
as in the following:

dataSet = new DataSet("General");

dataSet.Tables.Add(table1);

dataSet.Tables.Add(table2);
 
4. Next we add a reference to the Microsoft.Office.Interop to the project from "Project" -> "Add Reference".

add Reference Interop

5. Now we create an Object for the Excel Application using the ApplicationClass as in the following:

Microsoft.Office.Interop.Excel.ApplicationClass ExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
 
6. Next we loop through the DataTables in DataSet using the DataTableCollection class as in the following:
 

DataTableCollection collection = dataSet.Tables;

  
7. Now, we need to store the Header details for the DataTables in a DataSet in Excel using code as in the following:
 

for (int j = 1; j < table.Columns.Count + 1; j++)

{

   ExcelApp.Cells[1, j] = table.Columns[j - 1].ColumnName;

}
 

8. And then we store each row and column values of the DataTables to an Excel Sheet as in the following:

// Storing Each row and column value to excel sheet

for (int k = 0; k < table.Rows.Count; k++)

{

    for (int l = 0; l < table.Columns.Count; l++)

    {

        ExcelApp.Cells[k + 2, l + 1] =

        table.Rows[k].ItemArray[l].ToString();

     }

}


Complete Source Code
 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using Microsoft.Office.Interop.Excel;

 

namespace ExportDataSetToExcel

{

    public partial class Form1 : Form

    {

        //Create a DataSet and put both tables in it.

        System.Data.DataSet dataSet = null;

        public Form1()

        {

            InitializeComponent();

        }

 

        private void btnclose_Click(object sender, EventArgs e)

        {

            this.Close();

        }

 

        private void btnExport_Click(object sender, EventArgs e)

        {

            // Create two DataTable instances.

            System.Data.DataTable table1 = new System.Data.DataTable("Employee");

            table1.Columns.Add("EMPNO");

            table1.Columns.Add("ENAME");

            table1.Rows.Add("7786", "Vinoth");

            table1.Rows.Add("8476", "Senthil");

            table1.Rows.Add("1256", "Jayanth");

            table1.Rows.Add("7896", "Ganesh");

            table1.Rows.Add("4563", "Baskar");

            table1.Rows.Add("7894", "Vimal");

 

            System.Data.DataTable table2 = new System.Data.DataTable("Customer");

            table2.Columns.Add("CUSTID");

            table2.Columns.Add("ITEMS");

            table2.Rows.Add(1, "Gelusil");

            table2.Rows.Add(1, "Amlong 4.5");

            table2.Rows.Add(2, "Crocin");

            table2.Rows.Add(3, "Strepsils");

 

            // Create a DataSet and put both tables in it.

            dataSet = new DataSet("General");

            dataSet.Tables.Add(table1);

            dataSet.Tables.Add(table2);

 

            try

            {

                Microsoft.Office.Interop.Excel.ApplicationClass ExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();

                Workbook xlWorkbook = ExcelApp.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);

 

                // Loop over DataTables in DataSet.

                DataTableCollection collection = dataSet.Tables;

 

                for (int i = collection.Count; i > 0; i--)

                {

                    Sheets xlSheets = null;

                    Worksheet xlWorksheet = null;

                    //Create Excel Sheets

                    xlSheets = ExcelApp.Sheets;

                    xlWorksheet = (Worksheet)xlSheets.Add(xlSheets[1],

                                   Type.Missing, Type.Missing, Type.Missing);

 

                    System.Data.DataTable table = collection[i - 1];

                    xlWorksheet.Name = table.TableName;

 

                    for (int j = 1; j < table.Columns.Count + 1; j++)

                    {

                        ExcelApp.Cells[1, j] = table.Columns[j - 1].ColumnName;

                    }

 

                    // Storing Each row and column value to excel sheet

                    for (int k = 0; k < table.Rows.Count; k++)

                    {

                        for (int l = 0; l < table.Columns.Count; l++)

                        {

                            ExcelApp.Cells[k + 2, l + 1] =

                            table.Rows[k].ItemArray[l].ToString();

                        }

                    }

                    ExcelApp.Columns.AutoFit();

                }

                ((Worksheet)ExcelApp.ActiveWorkbook.Sheets[ExcelApp.ActiveWorkbook.Sheets.Count]).Delete();

                ExcelApp.Visible = true;

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message);

            }

        }

    }

}
 
ScreenShots

Table in Excel

Customer Table
 
Conclusion
 

In this article we have explained how to Export Data from a DataSet to an Excel Sheet using Microsoft.Interop.Excel Library.

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