ASP. NET check whether the file exists

This tutorial shows how to verify whether a file exists and how to execute some lines of code before checking whether a file exists. It can prevent the files that are being manipulated by error information from not existent.

This tutorial shows how to verify whether a file exists or does not receive an Execution code representation about the file. C.


It is helpful to check whether a file exists before executing certain lines of code. It can prevent the files that are being manipulated by error information from not existent, for example. Using System. IO, we can check whether a file exists in a directory for convenience.

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 see 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 See"/> <br/> <Asp: Label ID = "Label1" runat = "server"> </asp: Label> </form>

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Logic check to see if there is any text in the text, press the button first. If there is text currently, it will check to see if the text file is in a folder on the media. The user will be notified if there is a file or no.
Code hiding 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 .";}}
ElseLabel1.Text = "Please enter some text .";}

}

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