In order to use standard mask in RadMaskedTextBox, you need to set the RadMaskedTextBox's MaskType property to Standard.

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<telerik:RadMaskedTextBox MaskType="Standard" />

This subsection describes the mask characters that can be used when the MaskType property is set to Standard.

• 0 - digit, required. This element will accept any single digit between 0 and 9.
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  <telerik:RadMaskedTextBox Mask="0000" MaskType="Standard" />

  
• 9 - digit, required. This element will accept any single digit between 0 and 9.
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  <telerik:RadMaskedTextBox Mask="9999" MaskType="Standard" />

  
• # - digit or space, optional. If this position is blank in the mask, it will be rendered as the character in the Placeholder property. Plus (+) and minus (-) signs are allowed.
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  <telerik:RadMaskedTextBox Mask="#######" MaskType="Standard" />

  
• L - letter, required. Restrict input to the ASCII letters a-z and A-Z. This mask element is equivalent to [a-zA-Z] in regular expressions.
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  <telerik:RadMaskedTextBox Mask="LLLL" MaskType="Standard" />

  
• a - alphanumeric, optional. Accept any letter or digit.
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  <telerik:RadMaskedTextBox Mask="aaaa" MaskType="Standard" />

  
• l - accepts letters or space, optional.
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  <telerik:RadMaskedTextBox Mask="llll" MaskType="Standard" />

  
• \ - escape. Escapes a mask character, turning it into a literal. "\\" is the escape sequence for a backslash.
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  <telerik:RadMaskedTextBox Mask="\#\\###" MaskType="Standard" />

  
• Any other characters - literals. All non-mask elements will appear as themselves within RadMaskedTextBox. Literals always occupy a static position in the mask at run time, and cannot be moved or deleted by the user.
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  <telerik:RadMaskedTextBox Mask="Number: ####" MaskType="Standard" />

  

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