Read text (.txt) file and display in ASPX page using C# and VB.Net in ASP.Net

Hi indradeo,

Check this example. Now please take its reference and correct your code.

HTML

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload" onclick="OnClickUpload"/>
<br />
<asp:Label ID="lblText" runat="server" />

Namespaces

C#

using System.IO;
using System.Text;

VB.Net

Imports System.IO
Imports System.Text

Code

C#

protected void OnClickUpload(object sender, EventArgs e)
{
    string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
    if (!Directory.Exists(Server.MapPath("~/Files")))
    {
        Directory.CreateDirectory(Server.MapPath("~/Files"));
    }
    string path = Server.MapPath("~/Files/" + fileName);
    FileUpload1.SaveAs(path);
    if (File.Exists(path))
    {
        string[] texts = File.ReadAllLines(path);
        StringBuilder sb = new StringBuilder();
        foreach (string text in texts)
        {
            sb.Append(text);
            sb.Append("<br/>");
        }
        lblText.Text = sb.ToString();
    }
}

VB.Net 

Protected Sub OnClickUpload(ByVal sender As Object, ByVal e As EventArgs)
    Dim fileName As String = Path.GetFileName(FileUpload1.PostedFile.FileName)

    If Not Directory.Exists(Server.MapPath("~/Files")) Then
        Directory.CreateDirectory(Server.MapPath("~/Files"))
    End If

    Dim path As String = Server.MapPath("~/Files/" & fileName)
    FileUpload1.SaveAs(path)
    If File.Exists(path) Then
        Dim texts As String() = File.ReadAllLines(path)
        Dim sb As StringBuilder = New StringBuilder()
        For Each text As String In texts
            sb.Append(text)
            sb.Append("<br/>")
        Next
        lblText.Text = sb.ToString()
    End If
End Sub

Screenshot