Suppose you want to verify that the user has entered a value into a text box named txtInput. Which of the following code segments responds with an appropriate message if the user does not enter a value? A) If txtInput.text "" Then lblStatus.Text = "No data has been entered" End If B) If txtInput.Text = " " Then lblStatus.Text = "No data has been entered" End If C) If txtInput String.Empty Then lblStatus.Text = "No data has been entered" End If D) If txtInput.Text = String.Empty Then lblStatus.Text = "No data has been entered" End If

Question

Suppose you want to verify that the user has entered a value into a text box named txtInput. Which of the following code segments responds with an appropriate message if the user does not enter a value? A) If txtInput.text < > "" Then lblStatus.Text = "No data has been entered" End If B) If txtInput.Text = " " Then lblStatus.Text = "No data has been entered" End If C) If txtInput < > String.Empty Then lblStatus.Text = "No data has been entered" End If D) If txtInput.Text = String.Empty Then lblStatus.Text = "No data has been entered" End If

Quizplus · Accepted Answer

Choice D checks if the value of txtInput.Text is equal to String.Empty, which means it is empty or no value has been entered. This is the correct way to check for an empty input in a text box. Choice A also checks for non-empty input, but using the "< >" operator is not recommended as it can lead to unexpected behavior. Choice B checks for a space character which may not be the same as an empty input. Choice C also checks for non-empty input but using the "< >" operator instead of the ".Text" property is incorrect.

Suppose You Want to Verify That the User Has Entered