ASP .Net C# public static bool

Hi,

Trying to create a public bool to return true/false if the url contains any invalid characters.  I need the true/false for some other evaluation scripts that I have in my application.  This is proabably pretty simple, but I have a class called mod and within mod is this class.  I can't seem to retrieve the errors.

public static bool IsSafe(string furl)
    {

    String theurl = furl;
    bool safeUrl = true;

    if (!theurl.IsNullOrEmpty) {

    if theurl.IndexOf('=') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf(':') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('=') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('?') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('&') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('#') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('(') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf(')') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('<') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('>') != 0) {
     safeUrl = false;
    }
    /*if theurl.IndexOf("\'") != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('\"') != 0) {
     safeUrl = false;
    }*/
    if theurl.IndexOf('!') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('@') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('$') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('%') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('^') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('*') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('+') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('~') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('|') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('{') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('}') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf(']') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('[') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf('\\') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf(';') != 0) {
     safeUrl = false;
    }
    if theurl.IndexOf(' ') != 0) {
     safeUrl = false;
    }
    }

     return safeUrl;
    
    }

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