How do I validate textboxes in a datasource, windows form, c#

Question

You could use your validation code at the textbox TextChanged event so before someone presses the button the validation will happen.. In case user doesn't change the textbox and remains empty or the default value you have you can write an if statement before the try block on the button click event "raising" error and showing the relevant message to the user..Especially for the "Student Type" in case that the types are explicitly defined and the user has to choose among some values you could use combobox instead of textbox. At the combobox drop down event you could fill the combo list of values as shown on the example below.
Of course again you could validate for no value selected with an easy if statement before the try block on the button click event..
cbosttype.Items.Clear(); cbosttype.Items.Add("Type 1"); ...

Answer 1

What is the easiest way to validate textboxes that need to be checked before they go through. I have 2 tables I have to insert my data into as well and that's just for one group, in total I have 3 groups but just a helpful tip towards the one will be fine.It needs to be checked before it runs so how would I do it before the try/catch block and still just use the one button click.I have the main table which is 'Person' and then 3 sub tables; 'Student', 'Teacher', 'Administration'.Not all the textboxes need to be validated. sAdd2.Text and StudentType.Text.My normal code isprivate void sNew_Click(object sender, EventArgs e) { try { personTableAdapter.Insert(sFirstName.Text, sSurname.Text, Convert.ToDateTime(sDoB.Text), sPhone.Text, sAdd1.Text, sAdd2.Text, sSuburb.Text, sState.Text, sPostcode.Text, StudentType.Text); ...
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