You need to include namespace in your C# class to use EmailAddress data annotation. data annotation to validate email in C# We can also validate email address using EmailAddress data annotation in C# class, suppose here is my StudentModel.cs class using Remote Validations in MVC (Check if Email id exists in database) Validate email address using Data Annotation in MVC C# Model Verify email address exists or not? (With email id validation in C#) If desired, give the project a name other than the. In the New Project dialog box, select Console Application. Start up VB 2010 Express and click the New Project link: 2. The sample application built here serves as a model for the subsequent 'Try It' sample programs. In the above code, we are using given regular expression to validate email address string pattern = might also like to read: The steps for creating a VB.NET Console Application are illustrated below.
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When validating an email address using regex, you need to include namespace in your C# code, let's take a look at an example using System Ĭonsole.WriteLine(EmailId1+ " is a valid Email address ") Ĭonsole.WriteLine(EmailId1 + " is not a valid Email address") Ĭonsole.WriteLine(EmailId2+ " is Valid Email address ") Ĭonsole.WriteLine(EmailId2 + " is Not a Valid Email is a valid Email is Not a Valid Email address
#Vb net 2010 console application check input is like string code
This not only gives the user as many chances as they need, but it saves you from having to duplicate your code inside both of the If blocks.It is very common part of the web-application to include email address, and for this we require to validate if email address is correct and acceptable to save in database or not, so in this post, I have explained how we can validate email address in C# using regex and without using regex also (using data annotation in mvc).
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That way, it will keep running over and over until the user manages to enter a valid number. :-)īeyond fixing that immediate problem, it would also be better to replace your If/ Else If statements with a While loop. That might be a bit too forward-looking in your case, though. ) as the decimal separator, and others use the comma ( ,), this is necessary for a culture-neutral application. You could get away with using this simple overload, but it's probably "better" to use the somewhat more complicated version because it allows you to specify the culture to use when attempting to parse the specified value. The function returns a Boolean value that indicates success or failure. The simple overload of this method accepts only two parameters: the string value you want to convert (in your case, as returned by the Console.ReadLine() method) and a reference (in VB.NET terms, a value that is passed ByRef) to a variable of type Decimal that will be filled in with the result of the conversion, if it is successful. So rather than the CDec operator, you probably want to switch to using the Decimal.TryParse method, which has the advantage of separating the success/failure from the actual converted value. You're compensating for this by checking to see if the entered value was converted to 0, but that means you're going to display the rude error message if they enter 0, which is actually a valid temperature value! The biggest problem with your current method of validating the input is that the CDec operator doesn't return an error when the conversion fails. 'Purpose: To Convert User Input Celcius to Output FahrenheitĬonsole.Write("Enter the degrees in Celsius: ")Ĭonsole.WriteLine("Don't make me ask again! ENTER THE DEGREES IN CELSIUS: ")Ĭonsole.WriteLine("Degrees in Fahrenheit = " & decFahrenheit) I want to make sure that if the user just hits enter without entering the degrees in Celsius, then an if else statement will catch and write to enter Celsius again. I'm just creating a very simple console application that accepts user input: degrees in Celsius, and converts it into Fahrenheit. Vb is not my language of choice, but I have to do this for school and I'm not having a very easy time with VB's documentation.