Page 78 - DCAP312_WEB_TECHNOLOGIES_II

Web Technologies-II

Notes • Greater Than
• GreaterThanEqual

• LessThan
• LessThanEqual

• DataTypeCheck
The Range Validator Control

The RangeValidator server control is analogous to the CompareValidator server control, but the
RangeValidator server control compares what is entered into the form field with two values and
makes sure that what was entered by the client is between these two specified values.

For instance, imagine that we have a text box where we want end users to enter their ages.
Instead of being greater than or less than a specific constant, we want the values entered to be
between a specific ranges of numbers. For this, we use the RangeValidator server control, as
illustrated in example.

Using the Range Validator Server Control to Work with a Range of Numbers
Age:
<asp:TextBox id= “TextBox1” runat= “server”></asp:TextBox>

<asp:RangeValidator id= “RangeValidator1” runat= “server”
ControlToValidate= “TextBox1” Type= “Integer”
ErrorMessage= “You must be between 30 and 40”
MaximumValue= “40” MinimumValue= “30”></asp:RangeValidator>
In this case, the user should enter a value between 30 and 40 in the text box.
If some number is entered that is outside of this range, the RangeValidator
server control fires an error message and considers the form submission
invalid.
The Type property enables us to create comparisons against many changed
.NET Framework types, such as String, Integer, Double, Date, and Currency.
These choices allow us to do a number of range comparisons. For instance, we
can use the Currency value in the Type property to retrieve monetary-value
entries that are within a certain range. We can also use the Date value for the
Type property to make sure that the entry is between specific date ranges.
Also, just as we can use the String data type in the CompareValidator server
control, we can use the String data type with the RangeValidator server control
to make sure that the value entered falls within a specific range of characters.
For example, if the user is entering her last name, and we want only people
with last names starting with M and P to proceed, we can easily do this by
using the RangeValidator server control, as illustrated in Example.

Comparing an Entry to a Range of Characters
Last name:
<asp:TextBox id= “TextBox1” runat= “server”></asp:TextBox>

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