How to check whether a TextBox Has any Text in vb

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_{Saturday, September 28, 2013 7:50 AM}

Visual Studio MSDN

All replies (8)

_{Sunday, September 29, 2013 3:29 AM ✅Answered | 1 vote}

How to check whether a TextBox Has any Text in vb

Visual Studio MSDN

You can do that in so many ways but you don't mention what method you desire to perform the test with. This code uses the mouse hovering over the TextBox to begin the test.

Private Sub TextBox1_MouseHover(sender As Object, e As EventArgs) Handles TextBox1.MouseHover
        If TextBox1.TextLength = 0 Then
            MessageBox.Show("TextBox is empty")
        End If
End Sub

By the way Cor, congratulations on going over 100,000. That's awesome.

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_{Saturday, September 28, 2013 7:53 AM}

if(TextBox1.Text!="")
{
…………
}

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_{Saturday, September 28, 2013 9:27 AM | 1 vote}

That has endless ways and is mostly done by the personal preference of the programmer.

I like the most the one like thankfullheart shows (without that ! because that is VBA).

But there are many who use

TextBox1.Text=""
TextBox1.Text.Length = 0
String.IsNullOrEmpty(TextBox1.Text)
TextBox1.Text = String.Empty

Success
Cor

_{Saturday, September 28, 2013 9:49 AM}

First many thanks Cor;)

Then I doubt I cannot say TextBox.Text.IsEmpty？And What do you mean "not in all frameworks"? I think Text's type is String, but String doesn't have such a method at all;)

I only see string's static method：IsNullOrEmpty……

So can you list some samples for us in details?

_{Saturday, September 28, 2013 10:55 AM | 1 vote}

And going with any method you desire as a personal choice if using VS2008 or higher we can make an extension method.

In this case IsNullOrWhiteSpace is Framework 4 or higher

<Runtime.CompilerServices.Extension()> _
Public Function IsEmpty(ByVal sender As TextBox) As Boolean
    Return String.IsNullOrWhiteSpace(sender.Text)
End Function

Usage

If TextBox1.IsEmpty Then
    MessageBox.Show("Empty")
Else
    MessageBox.Show(TextBox1.Text)
End If

Please remember to mark the replies as answers if they help and unmark them if they provide no help, this will help others who are looking for solutions to the same or similar problem.

_{Saturday, September 28, 2013 11:01 AM}

        If TextBox1.Text = "" Then Debug.WriteLine("empty")

        If TextBox1.Text = String.Empty Then Debug.WriteLine("empty")

        If String.IsNullOrEmpty(TextBox1.Text) Then Debug.WriteLine("empty")

        If TextBox1.TextLength = 0 Then Debug.WriteLine("empty")

"Those who use Application.DoEvents() have no idea what it does and those who know what it does never use it." JohnWein

Multics

_{Saturday, September 28, 2013 11:04 AM}

Yes I should not be to sure of things, I never use it, I use the same method like you do.

Changed it.

Thanks
Cor

_{Sunday, September 29, 2013 12:56 AM}

No problem Cor;)

I suspected whether there's a method like IsEmpty(string)……But I didn't find that at all……

Last updated on 2013-09-28

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How to check whether a TextBox Has any Text in vb

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