What are VB Me and MyBase Equivalents in C#?

What are VB Me and MyBase Equivalents in C#?

VB	C#
Me	this
MyBase	base

Use securitytrimming to limit role views of Menu and SiteMap

Use securitytrimming to limit role views of Menu and SiteMap.

Modify the Web.config file's configuration tag with:

    <system.web>
    <siteMap defaultProvider="secureProvider">
      <providers>
        <add name="secureProvider" type="System.Web.Xml




Provider"
             siteMapFile="web.sitemap" securityTrimmingEnabled="true"/>
      </providers>
    </siteMap>
    </system.web>

Then modify Web.sitemap to make sure roles parameter is set to * or admin. Notice how I explicitly set the nodes roles parameter in the links outside the website

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
  <siteMapNode url="SiteMap.aspx" title="Site Map"  description="Site Map">
    <siteMapNode url="Default.aspx" title="Home"  description="Home" roles="*">
      <siteMapNode url="Login.aspx" title="Login/Logout"  description="Login or Logout" />
      <siteMapNode url="About.aspx" title="About"  description="About" />
    </siteMapNode>
    <siteMapNode url="~/Tools/Tools.aspx" title="Tools"  description="" roles="*">
      <siteMapNode url="~/Tools/GrowthAnalysis.aspx" title="Growth Analysis"  description="" />
      <siteMapNode url="~/Tools/FundamentalAnalysis.aspx" title="Fundamental Analysis"  description="" />
      <siteMapNode url="~/Tools/PriceToSalesAnalysis.aspx" title="Price To Sales Analysis"  description="" />
      <siteMapNode url="~/Tools/TechnicalAnalysis.aspx" title="Technical Analysis"  description="" />
    </siteMapNode>
    <siteMapNode url="~/MyLists/MyLists.aspx" title="My Lists"  description="" roles="*">
      <siteMapNode url="~/MyLists/Management.aspx" title="Management"  description="" />
      <siteMapNode url="~/MyLists/Tracker.aspx" title="Tracker"  description="" />
    </siteMapNode>
    <siteMapNode url="~/MarketWatch/MarketWatch.aspx" title="Market Watch"  description="" roles="*">
      <siteMapNode url="~/MarketWatch/MarketSummary.aspx" title="Market Summary"  description="" />
      <siteMapNode url="~/MarketWatch/SectorSummary.aspx" title="Sector Summary"  description="" />
      <siteMapNode url="~/MarketWatch/IntermarketSummary.aspx" title="Inter-market Summary"  description="" />
      <siteMapNode url="~/MarketWatch/WorldMarketSummary.aspx" title="World Market Summary"  description="" />
    </siteMapNode>
    <siteMapNode url="~/Media.aspx" title="Media" description="" roles="*">
      <siteMapNode url="http://www.bloomberg.com/news/av/" title="Bloomberg Audio/Video" description="" roles="*" />
      <siteMapNode url="http://www.thestreet.com/_tscnav/audio/taskaudio/index.html" title="Real Story With Aaron Task"  description="" roles="*" />
      <siteMapNode url="http://www.thestreet.com/_tscnav/video/index.html" title="TheStreet.com TV" description="" roles="*" />
      <siteMapNode url="http://online.wsj.com/public/us" title="Wall Street Journal"  description="" roles="*" />
      <siteMapNode url="http://www.nytimes.com/pages/business/index.html" title="New York Times Business"  description="" roles="*" />
      <siteMapNode url="http://markets.usatoday.com/custom/usatoday-com/html-markets.asp" title="USA Today Markets" description="" roles="*" />
      <siteMapNode url="http://www.briefing.com/Investor/Public/MarketSnapshot/HeadlineHits.htm" title="Briefing.com Headline Hits" description="" roles="*" />
      <siteMapNode url="http://www.pbs.org/nbr/" title="PBS Nightly Business Report" description="" roles="*" />
      <siteMapNode url="http://www.redoption.com/shadow_video.php" title="RedOption Shadow Trader Video" description="Weekend Update" roles="*" />
    </siteMapNode>
    <siteMapNode url="~/Commentary.aspx" title="Commentary"  description="" roles="*">
      <siteMapNode url="http://stockmonger.blogspot.com/" title="Stock Monger"  description="" roles="*" />
      <siteMapNode url="http://find.thestreet.com/cgi-bin/texis/find/results.html?nh=20&amp;t=Cramer" title="Jim Cramer"  description="" roles="*" />
      <siteMapNode url="http://www.rightsideadvisors.com/advisors/default.aspx?" title="Richard Suttmeier"  description="" roles="*" />
      <siteMapNode url="http://articles.moneycentral.msn.com/Commentary/Experts/Jubak/Jim_Jubak.aspx" title="Jim Jubak"  description="" roles="*" />
      <siteMapNode url="http://bigpicture.typepad.com/" title="The Big Picture With Barry Ritholtz"  description="" roles="*" />
    </siteMapNode>
    <siteMapNode url="~/Admin/Admin.aspx" title="Admin" description="" roles="Admin">
      <siteMapNode url="~/Admin/UpdateAllStocks.aspx" title="Update All Stocks" description="" roles="Admin"  />
      <siteMapNode url="~/Admin/StockScaffold.aspx" title="Stock Scaffold"  description="" roles="Admin" />
      <siteMapNode url="~/Admin/ManageRoles.aspx" title="Manager User Roles"  description="" roles="Admin" />
      <siteMapNode url="~/Admin/ManageLists.aspx" title="Manage Lists"  description="" roles="Admin" />
    </siteMapNode>
  </siteMapNode>
</siteMap>

Opening, Reading, and Writing a file

Here is an example of Opening/Reading a file in btnOpen_Click and Writing in btnSave_Click:

    protected void btnOpen_Click(object sender, EventArgs e)
    {
        if (string.IsNullOrEmpty(txtFileName.Text)) txtFileName.Text="c:/temp/temp.txt";
        StreamReader sr = null;
        try
        {
            sr = new StreamReader(txtFileName.Text);
            txtFileContent.Text = sr.ReadToEnd();
            sr.Close();
            displayMessage("Successfully opened file");
        }
        catch (Exception ex)
        {
            displayMessage(ex.Message);
        }
        finally
        {
            sr.Close();
        }
    }
    protected void btnSave_Click(object sender, EventArgs e)
    {
        if (string.IsNullOrEmpty(txtFileName.Text)) txtFileName.Text = "c:/temp/temp.txt";
        StreamWriter sw = null;
        try{
            sw = new StreamWriter(txtFileName.Text);
            string[] ar;
            ar = txtFileContent.Text.Split(Environment.NewLine.ToCharArray());
            foreach (string sIn in ar)
            {
                if(!string.IsNullOrEmpty(sIn))
                    sw.Write(sIn.Trim()+Environment.NewLine);
            }
        }catch (Exception ex) 
        {
            displayMessageLine(ex.Message);
        }
        finally{
            sw.Close();
        }
    }

Using a nullable boolean.

It is possible to assign a nullable boolean in C#. The trick is to use ? in the declaration. Once declared, one can use the HasValue() method. An example follows:

    protected void Page_Load(object sender, EventArgs e)
    {
        bool? isUser = null;
        lblStatus.Text = isUser.HasValue.ToString(); //displays false
        // an int example: Nullable<int> i = null;
    }
    protected void btnCheckStatus_Click(object sender, EventArgs e)
    {
        bool? isUser = false;
        lblStatus.Text = isUser.HasValue.ToString(); //displays true
    }

Creating a GUID from scatch

Sometimes you might want a psuedo-random string value. This can be done with:
System.Guid.NewGuid().ToString();

Handy C# tricks

Here are some handy C# tricks to increase productivity.
First, the code:

        //

        // Summary:

        //     Gets or sets a value that indicates whether the System.Web.UI.WebControls.MenuItem

        //     object is enabled, allowing the item to display a pop-out image and any child

        //     menu items.

        //

        // Returns:

        //     true if the menu item is enabled; otherwise, false.

        [Browsable(true)]

        [DefaultValue(true)]

        public bool Enabled { get; set; }

• The [Browsable(true)] allows the properties window to display the property or event.
• Default value does as you would expect if the variable is not directly set
• Short cut get and sets! Simple.

Help user redirect to secure target page after login and avoid extra navigation

Here's a solution for when the user needs to log in before accessing a secure page. This allows the user to avoid going through the menu system to go to the original page desired. I avoid some kind of error by using the false parameter in the redirect. The querystring of note is ReturnUrl.

    protected void Page_Load(object sender, EventArgs e)
    {            
        if (User.Identity.IsAuthenticated == false)
        {
            Response.Redirect("Login.aspx?ReturnUrl=DesiredPage.aspx", false);
        }
        else
        {
            MembershipUser user = Membership.GetUser().ProviderUserKey.ToString();
        }
    }

RedirectFromLoginPage Method

Proper ViewState use and the coalescing operator

Here is a quick lesson the ViewState object for viewing an object's state. I found the use of the coalescing operator helpful for future use instead of wordy if then else statments.

• public int CompanyID

  {

  get { return (int)(ViewState["CompanyID"] ?? 0); }

  set { ViewState["CompanyID"] = value; }

  }

The coalescing operator is a brother of if-then-else and
the more succinct: if (isX ? doA() : elseDoB).
I would describe coalescing as shorthand for: if (isX!=null) then getX() else getB().