Submitted by
planetsourcecode

on
Thu, 06/11/2009 - 00:48

Tips1#

Validate an IP address
We can easily validate an IP address by Adding Namespace

using System.Text.RegularExpressions;

public class IPAddressTextBox: RegExTextBox
{
public IPAddressTextBox()
{
InitializeComponent();
this.ValidationExpression = @"^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])$";
this.ErrorMessage = "The IP address must be in the form of 111.111.111.111";
}

Tips2#

Validate SSN(Social Security Number)

using System.Text.RegularExpressions;

public class SsnTextBox: RegExTextBox
{
public SsnTextBox()
{
InitializeComponent();
this.ValidationExpression = @"^\d{3}-\d{2}-\d{4}$";
this.ErrorMessage = "The social security number must be in the form of 555-55-5555";
}
}

Tips3#

How to restrict length size in text box.

The following function is used to restrict length size in text box

function MaxNumber(id,size)
{
if(id!=null)
{
var no =id.length;
if(no>=size)
{
alert("Maximum length exceeds");
event.returnValue=false;
return false;
}
else
{
return true;
}
}//End of IF

}//End Of Funciton

Tips4#

How to validate an IP address from 1.0.0.0 to 255.255.2The following code sample will help in validating an IP address

Public Function ValidIP(ByVal addr As String) As Boolean
'create our match pattern
Dim pat As String = "^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\." & _
"([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$"
Dim check As New Text.RegularExpressions.Regex(pat)
'boolean variable to hold the status
Dim valid As Boolean = False
If addr = "" Then
valid = False
Else
valid = check.IsMatch(addr, 0)
End If
'return the results
Return valid
End Function
55.255

Tips5#

How to check and see if a string is all uppercase in c#

The following code sample helps to check and see if a string is all uppercase in c#. Pass the method a string, read the results (true/false). Need reference to

System.Text.RegularExpressions Namespace

using System.Text.RegularExpressions;

public bool IsUppercase(string str) //string to check
{
bool upper; //to hold return value
string pattern = "[a-z]"; //variable to hold the search pattern
try
{
Regex AllCaps = new Regex(pattern);
if (AllCaps.IsMatch(str))
{
upper = false;
}
upper = true;
}
catch
{
upper = false;
}
return upper;
}

About the author:

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