Asp. NET checks whether a file exists

This tutorial shows how we can verify that the file exists or does not receive the execution code representations about the file. The version in C #.


It can be very useful to perform certain lines of code before checking for a file. It prevents error messages from attempting to manipulate files that do not exist, for example. Using System.IO, we can see if there is a file available in a directory that is convenient.

Using System.IO;

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The ASPX page looks like this:

<form id= "Form1" runat= "Server" > Search for a file (inc. extension to = if it exists in the media directory.<br/> Hint:try delete.gif<br/> <br/> <asp:textbox id= "TextBox1" runat= "Server" ></asp:textbox><br/> <asp:button id= "Button1" runat= "server" text= "Go"/><br/> <asp:label id= "Label1" runat= "Server" ></asp:Label> </form>

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Logical check to see if there is any text when the button is pressed first. If there is text currently, it will check to see if this text file is a folder on the media. The user will be notified if there is a file or not.
Code-behind looks like this:

Using System;
Using System.Data;
Using System.Configuration;
Using System.Web;
Using System.Web.Security;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.WebControls.WebParts;
Using System.Web.UI.HtmlControls;
Using System.IO;

public partial class _default:system.web.ui.page
{

protected void Page_Load (object sender, EventArgs e)
{

if (IsPostBack)

Doesfileexist (TextBox1.Text);

}

public void Doesfileexist (string searchstring)
{

if (TextBox1.Text!= "")
{

String Imagefolder;
Imagefolder = Server.MapPath ("/media/") + searchstring.tostring ();
if (file.exists (Imagefolder))
{

Label1.Text = "File <b>" + searchstring + "</b> <u>does</u> exist in '/media/' folder."

}
Else
{

Label1.Text = "File <b>" + searchstring + "</b> <u>does not</u> exist in '/media/' folder."

}

}
Else

Label1.Text = "Please enter some Text."

}

}

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