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Part 6 - Export data from sql server database tables to csv file using and c#

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In this video we will discuss exporting data from SQL Server to a notepad in the following 2 formats
1. Comma delimited format
2. Pipe delimited format

The data from the following 2 tables (Departments & Employees) need to be exported
export data to csv from sql server

export data from sql server to csv

End user should be able to select the format to export from the dropdownlist as shown below.
export data from sql server to comma delimited file

After exporting, the comma delimited data in the notepad should look as shown below
export data from sql server to csv c#

After exporting, the pipe delimited data in the notepad should look as shown below
export data from sql server to pipe delimited file

Step 1 : Create the tables (Departments & Employees
Create Table Departments
     ID int primary key,
     Name nvarchar(50),
     Location nvarchar(50)

Insert into Departments values (1, 'IT', 'New York')
Insert into Departments values (2, 'HR', 'London')

Create Table Employees
     ID int primary key,
     Name nvarchar(50),
     DepartmentID int foreign key references Departments(ID)

Insert into Employees values (1, 'Mike', 1)
Insert into Employees values (2, 'John', 1)
Insert into Employees values (3, 'Josh', 1)
Insert into Employees values (4, 'Mary', 2)
Insert into Employees values (5, 'Rosy', 2)

Step 2: Create a new empty empty web application. Name it ExportData. Add WebForm1.aspx to the project. Copy and paste the following HTML in WebForm1.aspx.
<div style="font-family: Arial">
    Format :
    <asp:DropDownList ID="ddlExportFormat" runat="server">
        <asp:ListItem Text="COMMA DELIMITED" Value="COMMA DELIMITED">
        <asp:ListItem Text="PIPE DELIMITED" Value="PIPE DELIMITED">
    <asp:Button ID="btnExport" runat="server" Text="Export"
    OnClick="btnExport_Click" />

Step 3: Copy and paste the following code in WebForm1.aspx.cs
using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Text;

namespace ExportData
    public partial class WebForm1 : System.Web.UI.Page
        protected void btnExport_Click(object sender, EventArgs e)
            string strDelimiter = ddlExportFormat.SelectedValue == "COMMA DELIMITED"
                                  ? "," : "|";

            string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            StringBuilder sb = new StringBuilder();
            using (SqlConnection con = new SqlConnection(cs))
                string strQuery = "SELECT [ID] ,[Name],[Location] FROM [Departments];";
                strQuery += "SELECT [ID],[Name],[DepartmentID] FROM [Employees];";
                SqlDataAdapter da = new SqlDataAdapter(strQuery, con);
                DataSet ds = new DataSet();

                ds.Tables[0].TableName = "Departments";
                ds.Tables[1].TableName = "Employees";

                foreach (DataRow depratmentDR in ds.Tables["Departments"].Rows)
                    int departmentId = Convert.ToInt32(depratmentDR["ID"]);
                    sb.Append(departmentId.ToString() + strDelimiter);
                    sb.Append(depratmentDR["Name"].ToString() + strDelimiter);
                    foreach (DataRow employeeDR in ds.Tables["Employees"]
                        .Select("DepartmentId = '" + departmentId.ToString() + "'"))
                        sb.Append(employeeDR["ID"].ToString() + strDelimiter);
                        sb.Append(employeeDR["Name"].ToString() + strDelimiter);

            string strFileName = strDelimiter == "," ? "Data.csv" : "Data.txt";

            StreamWriter file = new StreamWriter(@"C:\ExportedData\" + strFileName );

Step 4 : Include the connection string in web.config file
  <add name="DBCS"
        connectionString="server=.;database=Sample;integrated security = SSPI"/>

Step 5 : In C:\ drive, create a folder and name it ExportedData.

Run the application and test it.

dot net written test questions answers


  1. Hello Venkat. I really like your tutorials. Quick question related to ' Export data from sql server database tables to csv file using and c#'.
    Can we export 1000 rows from a database table and export them as .csv or excel sheet?
    My scenario is I need to create a button on the form and when the end user clicks on that, it will export database table from sql to excel and the excel table will be automatically opened. In my case, would it be the best option? Or is it going to take few minutes to dump sql tables to excel/csv file?


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