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2 When the current patient or visit is being changed by the user, every subscriber to the
3 Changing method has the option to "Veto" the event by Cancelling it:
4 <div class="code"><table width="100%" cellspacing="0" cellpadding="0"><tr><th><span class="copyCode" onclick="CopyCode(this)" onkeypress="CopyCode_CheckKey(this, event)" onmouseover="ChangeCopyCodeIcon(this)" onmouseout="ChangeCopyCodeIcon(this)" tabindex="0"><img class="copyCodeImage" name="ccImage" align="absmiddle" title="Copy image" src="../icons/copycode.gif" />Copy Code</span></th></tr><tr><td colspan="2"><pre>
5 public void Startup()
6 {
7 if (this.Context != null)
8 {
9 this.Context.Changed += new EventHandler&lt;ContextChangedArgs&gt;(Context_Changed);
10 this.Context.Changing += new EventHandler&lt;ContextChangedArgs&gt;(Context_Changing);
11 }
12
13 void Context_Changing(object sender, ContextChangingArgs e)
14 {
15 e.Cancel = needToFinishSomethingElseBeforeChangingContext;
16 }
17 </pre></td></tr></table></div>
18 However, a Veto is like a U.S. presential Veto and that it can be overridden. The WinFramework
19 or EHR can override any Veto so all components (even if they veto changes) must be prepared to
20 have the context changed at anytime.
21 </div><p />
22 <b>Namespace:</b>
23  <a href="967b19db-76c2-6522-a316-b5c445dc4f22.htm">IndianHealthService.BMXNet.Model</a><br />
24 <b>Assembly:</b>
25  <span sdata="assembly">BMXNET40</span> (in BMXNET40.dll)<h1 class="heading"><span onclick="ExpandCollapse(syntaxToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(syntaxToggle, event)" tabindex="0"><img id="syntaxToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Syntax</span></h1><div id="syntaxSection" class="section" name="collapseableSection" style=""><div id="syntaxCodeBlocks"><table class="filter" cellspacing="0" cellpadding="0"><tr id="curvedSyntaxTabs"><td class="leftTab" x-lang="CSharp"> </td><td class="middleTab" x-lang="CSharp"> </td><td class="rightTab" x-lang="CSharp"> </td><td class="leftTab" x-lang="VisualBasic"> </td><td class="middleTab" x-lang="VisualBasic"> </td><td class="rightTab" x-lang="VisualBasic"> </td><td class="leftTab" x-lang="ManagedCPlusPlus"> </td><td class="middleTab" x-lang="ManagedCPlusPlus"> </td><td class="rightTab" x-lang="ManagedCPlusPlus"> </td></tr><tr class="tabs" id="syntaxTabs"><td class="leftGrad" x-lang="CSharp"> </td><td class="tab" x-lang="CSharp" onclick="changeLanguage(data, 'CSharp', 'cs');">C#</td><td class="rightGrad" x-lang="CSharp"> </td><td class="leftGrad" x-lang="VisualBasic"> </td><td class="tab" x-lang="VisualBasic" onclick="changeLanguage(data, 'VisualBasic', 'vb');">Visual Basic</td><td class="rightGrad" x-lang="VisualBasic"> </td><td class="leftGrad" x-lang="ManagedCPlusPlus"> </td><td class="tab" x-lang="ManagedCPlusPlus" onclick="changeLanguage(data, 'ManagedCPlusPlus', 'cpp');">Visual C++</td><td class="rightGrad" x-lang="ManagedCPlusPlus"> </td></tr></table><div id="syntaxBlocks"><div class="code" x-lang="CSharp"><div id="CSharpDeclarationSection"><pre>event <a href="http://msdn2.microsoft.com/en-us/library/db0etb8x" target="_blank">EventHandler</a>&lt;<a href="6e814fb8-fe0b-6640-8f84-8f248f31affc.htm">ContextChangingArgs</a>&gt; <span class="identifier">Changing</span></pre></div></div><div class="code" x-lang="VisualBasic"><div id="VisualBasicDeclarationSection"><pre>Event <span class="identifier">Changing</span> <span class="keyword">As</span> <a href="http://msdn2.microsoft.com/en-us/library/db0etb8x" target="_blank">EventHandler</a>(<span class="keyword">Of</span> <a href="6e814fb8-fe0b-6640-8f84-8f248f31affc.htm">ContextChangingArgs</a>)</pre></div></div><div class="code" x-lang="ManagedCPlusPlus"><div id="ManagedCPlusPlusDeclarationSection"><pre> <span class="keyword">event</span> <a href="http://msdn2.microsoft.com/en-us/library/db0etb8x" target="_blank">EventHandler</a>&lt;<a href="6e814fb8-fe0b-6640-8f84-8f248f31affc.htm">ContextChangingArgs</a>^&gt;^ <span class="identifier">Changing</span> {
26 <span class="keyword">void</span> <span class="keyword">add</span> (<a href="http://msdn2.microsoft.com/en-us/library/db0etb8x" target="_blank">EventHandler</a>&lt;<a href="6e814fb8-fe0b-6640-8f84-8f248f31affc.htm">ContextChangingArgs</a>^&gt;^ <span class="parameter">value</span>);
27 <span class="keyword">void</span> <span class="keyword">remove</span> (<a href="http://msdn2.microsoft.com/en-us/library/db0etb8x" target="_blank">EventHandler</a>&lt;<a href="6e814fb8-fe0b-6640-8f84-8f248f31affc.htm">ContextChangingArgs</a>^&gt;^ <span class="parameter">value</span>);
28}</pre></div></div></div></div></div><h1 class="heading"><span onclick="ExpandCollapse(seeAlsoToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(seeAlsoToggle, event)" tabindex="0"><img id="seeAlsoToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />See Also</span></h1><div id="seeAlsoSection" class="section" name="collapseableSection" style=""><div class="seeAlsoStyle"><a href="b341d542-b478-5f92-f3a5-daa4de7e7739.htm">Context Interface</a></div><div class="seeAlsoStyle"><a href="967b19db-76c2-6522-a316-b5c445dc4f22.htm">IndianHealthService.BMXNet.Model Namespace</a></div></div><div id="footer"><div class="footerLine"><img width="100%" height="3px" src="../icons/footer.gif" title="Footer image" /></div>
29 <p />
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