Dynamically turn on/off Panel with Javascript

1.) Set client side OnChange event on a Button, CheckBox, etc...
  OnChanged="javascriptChangeHandler(this, 'Panel1');"

2.) Include the Panel named in the javascriptChangeHandler call in HTML
  <asp:Panel id="Panel1" Runat="server">
    Content...
  </asp:Panel>

3.) Add the Javascript function to the page or within included .js file
function javascriptChangeHandler (elem, panel) {
  var part = elem.id.substr(0, elem.id.lastIndexOf('_'));
  //Handle part logic to determine if panel should be turned off or on

  if ( part == null ) {
    elem.focus();
    return false;
  } else if ( part == "someIdentity" ) {
    document.getElementById(panel).style.display = "block";
    } else {
      document.getElementById(panel).style.display = "none";
    }
  }
}

Automatic logout

From within a MasterPage, insert the following script to automatically logout users from a site after a specified timespan.

<script language="javascript">
   __applicationPath = "<%=Request.ApplicationPath%>";
</script>

<script language="javascript">
  /function __logout(msg, loc ) {alert(msg); location.href = loc;}
  /function __startLogoutCountdown(){window.setTimeout("__logout('Login Expired: ================== \\nThis site uses a security feature that automatically logs you out from your session after 16 minutes.', '<%=Request.ApplicationPath%>/Logout.aspx');", 960000);};
</script>

At this point, you can collect and destroy the user's session from Logout.aspx

PGP encrypt and sign a file with GnuPG

In order to PGP encrypt and sign a file for transfer, the following items will be needed:

• 
  GnuPG open source software found here
  


• 
  A private PGP Key and the corresponding public key to provide the client.
  


• 
  A clients public PGP Key.
  


• 
  A file to be encrypted.
  

1. Install GnuPG onto the server responsible for encrypting the file.

2. Install the keys and give proper trust level onto the server that will be encrypting the files:

gpg --import [Filename] (installs a clients public key on server)

gpg --edit [name of key] (sets trust level of client public key)
command> trust
command> 4
command> y

3. View fingerprints of keys (if needed)

gpg --fingerprint (this will show the fingerprint to the keys)

4. Execute PGP command on file gpg --passphrase-fd 0 -u %sender% -r %recipient% --yes -a --quiet --output %outfilename% --sign --encrypt %filename%

5. If the encryption will be done within an application, this key can be added to the configuration and used in a "GeneratePGPFile" function call:


6. Main Function:

protected bool GeneratePGPFile(string recipient, string filename, ref string outFilename)
{
  try
  {
    string gpgCommand = ConfigurationSettings.AppSettings["GPGCommand"];
    string gpgKeyName = ConfigurationSettings.AppSettings["GPGKeyName"];
    string gpgPassPhrase = ConfigurationSettings.AppSettings["GPGPassPhrase"]); (if needed)
    string gpgFilename = outFilename;

    gpgCommand = gpgCommand.Replace("%passphrase%", gpgPassPhrase);
    gpgCommand = gpgCommand.Replace("%sender%", string.Format("\"{0}\"", gpgKeyName));
    gpgCommand = gpgCommand.Replace("%recipient%", string.Format("\"{0}\"", recipient));
    gpgCommand = gpgCommand.Replace("%filename%", string.Format("\"{0}\"", filename));
    gpgCommand = gpgCommand.Replace("%outfilename%", string.Format("\"{0}\"", gpgFilename));

    System.Diagnostics.ProcessStartInfo psi =
new System.Diagnostics.ProcessStartInfo("cmd.exe");

    psi.CreateNoWindow = true;
    psi.UseShellExecute = false;
    psi.RedirectStandardInput = true;
    psi.RedirectStandardOutput = true;
    psi.RedirectStandardError = true;
    psi.WorkingDirectory = Path.GetDirectoryName(filename);

    System.Diagnostics.Process process = System.Diagnostics.Process.Start(psi);
process.StandardInput.WriteLine(gpgCommand);

    process.StandardInput.Flush();
    process.StandardInput.Close();
    process.WaitForExit();
    process.Close();

    if (!File.Exists(gpgFilename)) {
      return false;
    }

  return true;
  }
  catch (Exception ex)
  {
    HandleError(ex);
    return false;
  }
}

Using onclick with ListItem within RadioButtonList Control

Below is a way to add an onclick event into the ListItems of a RadioButtonList Control:

Static RadioButtonList and ListItems within HTML
<asp:RadioButtonList id="citizenRbl" runat="server" RepeatDirection="Horizontal">
<asp:ListItem value="uscitizen" text="US Citizen"></asp:ListItem>
<asp:ListItem value="residentalien" text="Resident Alien"></asp:ListItem>
<asp:ListItem value="nonresidentalien" text="Non-Resident Alien"></asp:ListItem>
</asp:RadioButtonList>

Code Behind - add the onclick event to the parent control of the ListItems
citizenRbl.Attributes.Add("onclick", "CheckCitizenSelection('"+citizenRbl.ClientID+"')");

Javascript
<script language="Javascript">
function CheckCitizenSelection(rblID){
var rbl = document.getElementById(rblID);
var options = rbl.getElementsByTagName('input');
for(jj=0; jj<options.length; jj++)
{
  var cbox = options[jj];
  if(cbox.checked && cbox.value == "nonresidentalien"){
    alert('You choice was non-resident alien');
  }
}
}
</script>

Add client on click to asp repeater

To add a client side onclick event to buttons in a repeater, use the scenario below as a reference.

Within the web form:
<asp:Repeater ID="ItemsRpt" Runat="server">
  <ItemTemplate>
    <tr>
      <td><%#DataBinder.Eval(Container.DataItem, "ItemName")%></td>
      <td>
        <asp:Button ID="DeleteBtn" Runat="server" Visible=<%#System.Convert.ToBoolean(DataBinder.Eval(Container.DataItem, "canDelete"))%> Text="Delete" CommandArgument=<%#DataBinder.Eval(Container.DataItem, "ItemId")%> CommandName="DeleteItem" CssClass="Btn" CausesValidation="False"></asp:Button>
      </td>
    </tr>
  </ItemTemplate>
</asp:Repeater>

Within the code behind "InitializeComponent"
this.ItemsRpt.ItemCreated += new RepeaterItemEventHandler(ItemsRpt_ItemCreated);

and then...
private void PositionsRpt_ItemCreated(object sender, RepeaterItemEventArgs e)
{
  if (e.Item.DataItem != null)
  {
    Button btn = e.Item.FindControl("DeleteBtn") as Button;
    if (btn != null) {
      btn.Attributes.Add("onclick", "return confirm('Confirm the deletion of this item');");
    }
  }
}

SSRS check for blank parameters

Within an SSRS .rdl file you may want to check to see if a Parameter is null before you try to filter results, below are a couple solutions:

=IIf((LEN(Parameters!range.Value)>0), Parameters!range.Value, Fields!range.Value)

=IIf(IsNothing(Parameters!range.Value), Fields!range.Value, Parameters!range.Value)

DataBinder if else solution

Below is an example that will allow two different images to be displayed in an image control based on the DataBinder.Eval result.

<img src="<%# (Convert.ToInt32(DataBinder.Eval(Container.DataItem, "availabilityId")) == 1) ? "/images/available.gif" : "/images/scheduled.gif"%>" alt="schedule" id="scheduleImg" style="border:none"/>