# <Validate Type="XML">

The Validate tag whose type is set to "xml" is referred to as an XML Validator and is used to ensure the user provides a well-formed XML snippet as input for a given control. NOTE: that this provides very basic verification the XML is well-formed. Deeper checks are not performed.

# Syntax

<Validate 
    BackColor="color name|#dddddd"
    BorderColor="color name|#dddddd"
    BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge| Inset|Outset"
    BorderWidth="size"
    CssClass="string"
    Display="Static|Dynamic"
    EnableClientScript="True|False"
    Font-Bold="True|False"
    Font-Italic="True|False"
    Font-Names="string"
    Font-Overline="True|False"
    Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium| Large|X-Large|XX-Large"
    Font-Strikeout="True|False"
    Font-Underline="True|False"
    ForeColor="color name|#dddddd"
    Height="size"
    Message="string"
    Target="string"
    Text="string"
    Type="XML"
    Width="size" 
/>

# Remarks

The XML validator is one type of the <Validate> tag. When the Type attribute is set to xml, the control prevents the form from being submitted if its associated control does not contain well-formed XML. You associate a control with the <Validate> tag by setting its Target attribute to the ID of the control you wish to validate. The Message attribute is the text that will be displayed to the user when validation fails. If you are using the <ValidationSummary> tag, then you can also supply a Text attribute. When validation fails, the Text will be displayed where your <Validate> tag is and the Message will be displayed in the <ValidationSummary. The Display attribute determines if the the <Validate> tag will reserve space for its message in the page layout - typically resulting in blank space in your form -or whether it will dynamically display allocate the space for the message when validation fails. The <Validate> tag defaults to Dynamic display.

• BackColor: Color of the background of the control.

• BorderColor: Color of the border around the control.

• BorderStyle: Style of the border around the control. Defaults to NotSet.

• BorderWidth: Width of the border around the control, specified in units

• CssClass: Name of the Cascading Style Sheets (CSS) class used to style this control.

• Display: This attribute determines if the <Validate> tag will reserve space for its message in the page layout - typically resulting in blank space in your form -or whether it will dynamically allocate the space for the message when validation fails. Defaults to Dynamic display.

• EnableClientScript: Use the EnableClientScript property to specify whether client-side validation is enabled. Defaults to True.

• Font Properties: A series of attributes such as font-bold, font-size, etc. that allow you to control how the text in the control is displayed. More

• ForeColor: Sets the foreground color (typically the color of the text) of the control.

• Height: Height of the control, specified in units.

• Message: This is the text that will be displayed to the user, when validation fails. If you are using the <ValidationSummary>, then this is the message that will be displayed in the <ValidationSummary> when validation fails.

• Target: Set this attribute to the ID of the control you wish to validate.

• Text: If you are using the <ValidationSummary> tag, then you can also supply a Text attribute. When validation fails, the Text will be displayed where your <Validate> tag is and the Message will be displayed in the <ValidationSummary>.

• Type: When the Type attribute is set to xml, the control prevents the form from being submitted if its associated control does not contain well-formed XML.

• Width: Width of the control in units.

# Example

<AddForm>
  <SubmitCommand CommandText="INSERT INTO Users(FirstName, LastName, MyXml) 
                              VALUES(@FirstName, @LastName, @MyXml)" />
    <table>
      <tr>
        <td>
          <Label For="txtFirstName" Text="FirstName" /> 
          <TextBox Id="txtFirstName" DataField="FirstName" DataType="string" />
        </td>
      </tr>
      <tr>
        <td>
          <Label For="txtLastName" Text="Last Name" /> 
          <TextBox Id="txtLastName" DataField="LastName" DataType="string" />
        </td>
      </tr>
      <tr>
        <td>
          <Label For="txtXml" Text="Your XML" /> 
          <TextArea Id="txtXml" DataField="MyXml" DataType="string" />
          <Validate Type="xml" Target="txtXml" Message="Please enter well-formed XML" />
        </td>
      </tr>
      <tr>
        <td colspan="2">
          <AddButton Text="Add" />&nbsp;<CancelButton Text="Cancel" />
          <ValidationSummary />
        </td>
      </tr>
    </table>
</AddForm>