Creating Utility Class for Zip Code, Date and Integer Validation

Introduction

As mentioned in my previous blog, of creating Utility Class for Email ID and Phone Number Validation below is the code for validating Zip Code, Date and Integer.

In AppCode Folder create a file named as AppUtility.
Write the below mentioned code in the Utility page and access the same from any required page.

Validating Valid Zip Code.

public static Boolean IsValidZip(string strZip)
{
Regex objRegExp = new Regex("^[0-9]");
Match objMatch = objRegExp.Match(strZip);
return objMatch.Success;
}

Validating Valid Date.

public static Boolean IsValidDate(string strDOB)
{
try
{
string ValidDOB = "(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\\d\\d";
DateTime Dt = new DateTime(Convert.ToInt16(strDOB.Substring(6, 4)), Convert.ToInt16(strDOB.Substring(3, 2)),
Convert.ToInt16(strDOB.Substring(0, 2)));
DateTime curDate = DateTime.Now;
String date="01/01/1900";
DateTime minDate=Convert.ToDateTime(date);
Regex objRegExp = new Regex(ValidDOB);
Match objMatch = objRegExp.Match(strDOB);
if (objMatch.Success)
{
if (Dt > curDate)
{
return false;
}
else if (Dt < minDate)
{
return false;
}
else
{
return true;
}
}
else
{
return false;
}
}
catch
{
return false;
}
}

Validating Valid Integer

public static Boolean IsValidInteger(string strInt)
{

Regex objRegExp = new Regex("^[0-9]");
Match objMatch = objRegExp.Match(strInt);
if (objMatch.Success)
{
int value = Convert.ToInt32(strInt);
//Max Integer Value is 32767
if (value <= 32767 && value >= 0)
return true;
else
return false;
}
else
return false;
}

.AppUtility File

AppUtility app = new AppUtility ();
If (app.IsValidZip (txtZip.Text) || app.IsValidDate (txtDate.Text) || app.IsValidInteger (txtInteger.Text))
{
Success = true;
}