Validate SharePoint Special Characters on File Upload name - C#

You cannot use the following characters in a document name when you upload the document in SharePoint Site

o   Number sign (#)

o   Tilde (~) 

o   Percent (%)

o   Ampersand (&)

o   Asterisk (*)

o   Braces ({ })

o   Backslash (\)

o   Colon (:)

o   Angle brackets (< >)

o   Question mark (?)

o   Slash (/)

o   Plus sign (+)

o   Pipe (|)

o   Quotation mark (")

Here is the method to check that the documents contains any special characters   

protected bool IsValidFilename(string fileName){

              string pattern = "[\\~#%&*{}/:<>?|\"-]";

              try

              {

                  if (Regex.IsMatch(fileName, pattern))

                  {

                      isSpecialChar = true;

                  }

                  else

                  {

                      isSpecialChar = false;

                  }

              }

              catch (Exception)

              {

                 throw;

              }

              return isSpecialChar;

          }

S    Show a Pop-Up message if the upload file contains any special characters

if (isSpecialChar == true)

{

string script = "<script language='javascript'>alert('" + " ~  # % & * { }  : < > ? / + | are not allowed !" + "')</script>";

Page.ClientScript.RegisterClientScriptBlock(GetType(), "Register", script);

}

 

----------------------------------------------Shashika Hettiarachchi---------------------------------------