Controls - Do you include a "select all" checkBox on the top?

Do you have checkbox (on the top) that let users select or unselect all checkboxes underneath it? If you have a list of checkboxes, you are going to frustrate users unless you provide an easy way to select all. The best way to achieve this is to have a checkbox at the top.
<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "goodExample",
    figure: 'Good Example - Hotmail does this',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/HotmailSelectAll.gif"
/>


<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "default",
    figure: 'Google have done it a different way to provide multiple methods (All, All Read, All Unread, All Starred, and All Unstarred)',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/GmailSelectAll.gif"
/>

<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "badExample",
    figure: 'Bad Example - SQL Auditor - No CheckBox for users to perform a "select all"',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/SQLAuditorSelectAll\_Bad.jpg"
/>

<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "goodExample",
    figure: 'Good Example - SQL Auditor - CheckBox at the top of the column',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/SQLAuditorSelectAll\_good.jpg"
/>


<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "default",
    figure: 'Selecting all does this - selects all',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/SQLAuditorSelectAll\_All.jpg"
/>


<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "default",
    figure: 'Deselecting all does this - selects none',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/SQLAuditorSelectAll\_None.jpg"
/>


<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "default",
    figure: 'Selecting some should show the Indeterminate check state - aka customized selection',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/SQLAuditorSelectAll\_Customize.jpg"
/>

Private Sub CheckBoxSelectAll\_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) \_
Handles CheckBoxSelectAll.CheckedChanged
'Select checkbox in each row
For Each sDataGridViewRow As DataGridViewRow In Me.DataGridViewCustomer.Rows
sDataGridViewRow.Cells(0).Value = Me.CheckBoxSelectAll.Checked
Next
End Sub
Code: Code for selecting all checkboxes in a windows form

<imageEmbed
  alt="Image"
  size="large"
  showBorder={false}
  figureEmbed={{
    preset: "default",
    figure: 'Select all checkboxes in a web form',
    shouldDisplay: true
  }}
  src="/uploads/rules/controls-do-you-include-a-select-all-checkbox-on-the-top/../../assets/SelectAllCheckBox\_Web.jpg"
/>

&lt;script type="text/javascript"&gt;
function SeleteCheckBox()
{
for (var n=0; n &lt; document.form1.elements.length; n++)
{
if (document.form1.elements[n].type == "checkbox" && document.form1.elements[n].name == "gridview")
{
document.form1.elements[n].checked = document.getElementById("CheckBoxAll").checked;
}
}
}
&lt;/script&gt;
 Code: Code for selecting all checkboxes in a web form
We have suggestions for Visual Studio .NET about this at [A top CheckBox to "select all" in windows forms](http://www.ssw.com.au/ssw/Standards/BetterSoftwareSuggestions/MSForm.aspx#SelectAllCheckWindows) and [A top CheckBox to "select all" in web forms.](http://www.ssw.com.au/ssw/Standards/BetterSoftwareSuggestions/MSAjax.aspx#SelectAllCheckWeb)