Create Error Log files in Asp.net using C#, VB.NET with Example

By: Suresh Dasari Aug 5, 2015

Introduction:

Here I will explain how to create error log files in asp.net using c#, vb.net with example or code to create simple log files in asp.net using c#, vb.net. To generate log files in asp.net we need to get that errors in catch block and store it in folder or local drive in txt format or other format in asp.net using c#, vb.net.

Description:

In previous articles I explained bind all countries to dropdownlist in asp.net, generate random string or password in asp.net, Add or remove new row in gridview in asp.net, bind dropdownlist in gridview in asp.net, gridview examples in asp.net and many articles relating to dropdownlist, gridview, asp.net, c#,vb.net and jQuery. Now I will explain how to generate error log files in asp.net using c#, vb.net with example.

To create error log files in asp.net first create one new folder "logfiles" in your application then open your aspx page and write the following code

<title>Create Log Files in Asp.net using c#, vb.net</title>

</head>

<body>

<div>

<asp:Button ID="btnLog" runat="server" Text="Generate Log" onclick="btnLog_Click" />

</div>

</form>

</body>

</html>

Now add following namespaces in code behind

C# Code

using System;

using System.Web;

using System.Data.SqlClient;

using System.IO;

using System.Data;

After completion of adding namespaces you need to write the code like as shown below

protected void Page_Load(object sender, EventArgs e)

{

}

protected void btnLog_Click(object sender, EventArgs e)

{

try {

DataTable dt=new DataTable();

SqlConnection con = new SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB");

SqlCommand cmd = new SqlCommand("crudoperations", con);

cmd.CommandType = CommandType.StoredProcedure;

cmd.Parameters.AddWithValue("@status", "SELECT");

SqlDataAdapter da = new SqlDataAdapter(cmd);

da.Fill(dt);

con.Close();

}

catch(Exception ex){

logerrors(ex.Message);

lblresult.Text = "Error occured please check complete details in log file";

}

public void logerrors(string error)

{

string pageName = Path.GetFileName(Request.Path);

string filename = "Log_" + DateTime.Now.ToString("dd-MM-yyyy") + ".txt";

string filepath = Server.MapPath("~/logfiles/" + filename);

if (File.Exists(filepath))

{

using (StreamWriter stwriter = new StreamWriter(filepath, true))

{

stwriter.WriteLine("-------------------START-------------" + DateTime.Now);

stwriter.WriteLine("Page :" + pageName);

stwriter.WriteLine(error);

stwriter.WriteLine("-------------------END-------------" + DateTime.Now);

}

else

{

StreamWriter stwriter = File.CreateText(filepath);

stwriter.WriteLine("-------------------START-------------" + DateTime.Now);

stwriter.WriteLine("Page :" + pageName);

stwriter.WriteLine(error);

stwriter.WriteLine("-------------------END-------------" + DateTime.Now);

stwriter.Close();

}

VB.NET Code

Imports System.Web

Imports System.Data.SqlClient

Imports System.IO

Imports System.Data

Partial Class VBCode

Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

End Sub

Protected Sub btnLog_Click(ByVal sender As Object, ByVal e As EventArgs)

Try

Dim dt As New DataTable()

Dim con As New SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB")

Dim cmd As New SqlCommand("crudoperations", con)

cmd.CommandType = CommandType.StoredProcedure

cmd.Parameters.AddWithValue("@status", "SELECT")

Dim da As New SqlDataAdapter(cmd)

da.Fill(dt)

con.Close()

Catch ex As Exception

logerrors(ex.Message)

lblresult.Text = "Error occured please check complete details in log file"

End Try

End Sub

Public Sub logerrors(ByVal [error] As String)

Dim pageName As String = Path.GetFileName(Request.Path)

Dim filename As String = "Log_" + DateTime.Now.ToString("dd-MM-yyyy") + ".txt"

Dim filepath As String = Server.MapPath(Convert.ToString("~/logfiles/") & filename)

If File.Exists(filepath) Then

Using stwriter As New StreamWriter(filepath, True)

stwriter.WriteLine("-------------------START-------------" + DateTime.Now)

stwriter.WriteLine(Convert.ToString("Page :") & pageName)

stwriter.WriteLine([error])

stwriter.WriteLine("-------------------END-------------" + DateTime.Now)

End Using

Else

Dim stwriter As StreamWriter = File.CreateText(filepath)

stwriter.WriteLine("-------------------START-------------" + DateTime.Now)

stwriter.WriteLine(Convert.ToString("Page :") & pageName)

stwriter.WriteLine([error])

stwriter.WriteLine("-------------------END-------------" + DateTime.Now)

stwriter.Close()

End If

End Sub

End Class

Demo

Create Error Log files in Asp.net using C#, VB.NET with Example

Now open your log file in "logfiles" folder that would be like as following

Generated Error Log files in Asp.net using C#, VB.NET with Example

Download Sample Code Attached

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4 comments :

Ashish Kachhi said...: plz enable download....; August 6, 2015 at 9:53 PM
Suresh Dasari said...: Thanks ashish enabled download link; August 7, 2015 at 12:03 AM
MohanJS said...: StreamWriter stwriter = File.CreateText(filepath);
its throwing error while creating text file
Can u pls tell me y?; August 18, 2015 at 4:09 AM
Unknown said...: This comment has been removed by the author.; April 17, 2017 at 3:20 AM