Textbox text folder path validation in C#

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HI,

 I have a textbox control in c#

 When a user enters folder path(D:/files/TEMP/2WN) without extension in a textbox, how to validate the textbox path in button submit.


<asp:TextBox ID="txtFolderName" runat="server" MaxLength="50" Width="416px"></asp:TextBox>

<asp:RequiredFieldValidator ID="rfvFolderName" runat="server" ControlToValidate="txtFolderName" ForeColor="Red"   Display="Dynamic" ErrorMessage="Folder Name cannot be empty">


asp:RegularExpressionValidator
 ID="revFolderName" runat="server" ControlToValidate="txtFolderName"
 ErrorMessage="Invalid Folder Path" ValidationExpression="^(?:[\w]\:|\\)(\\[a-z_\-\s0-9\.]+)"></asp:RegularExpressionValidator>

Please give me idea.

Thanks inadvance

What I have tried:

ValidationExpression="^(?:[\w]\:|\\)(\\[a-z_\-\s0-9\.]+)"

a-zA-Z]:(\\w+)*\\[a-zA-Z0_9]+)

([a-zA-Z]:|\\\\\w[ \w\.]*)(\\\w[ \w\.]*|\\%[ \w\.]+%+)+|%[ \w\.]+%(\\\w[ \w\.]*|\\%[ \w\.]+%+)*)

Posted 22-May-18 8:37am

sai.2012

Updated 22-May-18 17:58pm

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Richard Deeming 22-May-18 15:12pm

REPOST
You have already posted this question:
https://www.codeproject.com/Questions/1245116/D-files-TEMP-WN-path-validation-regular-expression[^]

sai.2012 22-May-18 17:04pm

Forgot to Delete the old post , Now I deleted.

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jinto Jacob · Accepted Answer · 2018-05-22T17:59:00

hi
your regular expression is only checking the start not the ending of the string.

try add $ at the end.

^(?:[\w]\:|\\)(\\[a-z_\-\s0-9\.]+)$

it will remove chance of illegal characters at the end.

if you want to check for specific file formats add the formats as below

^(?:[\w]\:|\\)(\\[a-z_\-\s0-9\.]+)+\.(txt|gif|pdf|doc|docx|xls|xlsx)$

Textbox text folder path validation in C#

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Textbox text folder path validation in C#

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