Validating multiple text fields

Posted by / 28-Mar-2017 07:06

Validating multiple text fields

Within your "Accept" button click handler (the "save" button) process each control that Causes Validation to ensure that they are all valid...

Within your "Accept" button click handler (the "save" button) process each control that Causes Validation to ensure that they are all valid... I got the following tip from "Windows Forms Programming in C#" by Chris Sells, from Addison Wesley.

Text, " "c) = True Then result = result & "- Major field has spaces" & vb New Line End If If Is Numeric(txt Major. Substring(0, 1)) = True Then result = result & "- Major field course code is incorrect" & vb New Line End If 'phone validation If txt Phone. Length = 0 Then result = result & "- Phone field is empty" & vb New Line End If If Is Numeric(txt Phone. Cancel End Sub Private Sub btn Add Student_Click(By Val sender As System.

I have a form that has about 10 text boxes on it, they all have to be filled out before submitting is there a quick way to make sure that none are null or do I have to call out each textbox? Thanks Create a handler for the first textbox by double clicking on it, Use the error provider and validated event. I'll admit, I'm not very well versed in them as I've not taken the time to mess with them but I do know that you can validate these types of situations with them and that there are a lot of knowledgeable people that frequent this forum that can help you with them. Here is what I received when entering your data You could use this same thing for anything where you're testing length of the string. Text, " "c) = True Then result = result & "- First Name field is empty or contains illegal characters" & vb New Line End If Else Msg Box("First Name is empty") End If Public Class Form4 Private Sub Text First Name_Validating(By Val sender As Object, By Val e As System. If that isn't the way you want to go you could simply use . For example 'in the click event Dim str As String = "" str = Is Valid() If str = "" Then ' Its all valid so do w/e here Else msgbox("The following fields are invalid: " & str) End If 'the Is Valid Sub. Text 'join the array elements and place the result into a string variable new Student Record = Join(ary Data, " ") 'create a link between the form and the file with streamwriter and write to the text file If System. Also for: This way you've accomplished both of those in one block. To see what I mean, place Option Strict On at the top of your code above the Class I just pasted your code into a project and made mistakes in each of the fields per your If Statements and received a messagebox listing all the problems. It could be something with the input as you are assuming a lot of conversions that Option Strict ON would not allow and these could be mis-interpreted by the compiler. OK Exit Sub Else Msg Box("The following errors were found in your input:" & vb New Line & error Str) End If End Sub End Class I just pasted your code into a project and made mistakes in each of the fields per your If Statements and received a messagebox listing all the problems. It could be something with the input as you are assuming a lot of conversions that Option Strict ON would not allow and these could be mis-interpreted by the compiler. Set Error(Text First Name, "Name Cannot Contain Spaces and cannot be Zero length") e. Set Error(Text First Name, "") End If End Sub Private Sub Form4_Load(By Val sender As Object, By Val e As System.

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A validator can validate more than one field at a time.

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