C# - IsUri

  public static bool IsUri(string _uri){
    try{
 System.Uri ___tmp = new System.Uri(_uri);
    }catch(Exception _ex){
 return false;
    }
    return true;
  }

C# - IsDate

  public static bool IsDate(string _dt){
    try{
 System.DateTime ___tmp = System.DateTime.Parse(_dt);
    }catch(Exception _ex){
 return false;
    }
    return true;
  }

C# - IsNumeric

  public static bool IsNumeric(string _n){
    try{
 double ___tmp = System.Double.Parse(_n, System.Globalization.NumberStyles.Any);
    }catch(Exception _ex){
 return false;
    }
    return true;
  }

C# - WebControl to String

using System;
using System.IO;
using System.Web.Hosting;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Text;


public static String WebControlToString(Control _ctl)
{
  StringWriter sw = new StringWriter();
  System.String tab = "";
  HtmlTextWriter htw = new HtmlTextWriter(this.sw, tab);
  // or XhtmlTextWriter or Html32TextWriter
  _ctl.RenderControl( htw );
  return sw.ToString();
}

/* ****************************************************** *
  hl = new HyperLink();
  hl.NavigateUrl = "http://localhost/";
  hl.Text = "Lokaler Server";
  Console.WriteLine( WebControlToString( hl ) );
 * ****************************************************** */