check empty value of Textboxs in Form VB.net

Question

1.00/5 (3 votes)

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For Example I have 3 TextBoxs if one of them have empty value then
i need it alert a message like that >>Please Enter Values into txtName <<<</xml>

Posted 20-Jul-14 4:49am

phanithly

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[no name] 20-Jul-14 10:53am

And the question or problem is....?

phanithly 20-Jul-14 10:57am

it my Problem ..
here my code

Public Sub CheckEmptyTextbox(ByVal root As Control)
Dim txt As Control
For Each txt In root.Controls
If TypeOf txt Is TextBox Or TypeOf txt Is ComboBox Then
If txt.Text = "" Then
MsgBox("Please enter .....")
Exit Sub
Exit For
End If
End If
Next

[no name] 20-Jul-14 11:02am

And you think that we can magically know what it is that "not work good" means? What do you expect MsgBox to do on a web page? Do you think that a user half way around the world will be seeing a window displayed on your web server? Go get the ajaxToolkit and use that.

phanithly 20-Jul-14 10:58am

but it work not good like i want

phanithly 20-Jul-14 11:05am

Window Form

[no name] 20-Jul-14 11:10am

Then why did you tag the question as ASP.NET? What does SQL or C# have to do with your question? And you still have not explained what the problem is.

6 solutions

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Dave Kreskowiak · Accepted Answer · 2014-07-20T05:25:00

Solution 1

Google for "VB.NET Windows Forms Validation" and you'll come up with all kinds of ways to do this.

Posted 20-Jul-14 5:25am

Dave Kreskowiak

Sharmanuj · Accepted Answer · 2014-07-20T20:16:00

Hi,

Use this code to check the blank textbox for a form

VB

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Try
            For Each cntrl As Control In Me.Controls()
                If TypeOf cntrl Is TextBox Then
                    If CType(cntrl, TextBox).Text.Equals(String.Empty) Or (CType(cntrl, TextBox).Text = "") Then
                        MessageBox.Show("Please enter value in " & cntrl.Name.ToString())
                    End If
                End If
            Next
        Catch ex As Exception

        End Try

    End Sub

vangapally Naveen Kumar · Accepted Answer · 2014-07-20T21:19:00

Go through this code it may help you.............

i wrote this in c# convert this to vb.net.

C#

private void CheckTxt()
{
  try
  {
   List<Control> c = Controls.OfType<TextBox>().Cast<Control>().ToList();
   for (int i = 0; i < c.Count; i++)
   {
     if (c[i].Text.Trim () == string.Empty)
     {

       MessageBox.Show("Please enter.......");
       return;
     }
   }

  }
  catch (Exception ex)
  {

    throw ex;
  }
}

Atyant Srivastava · Accepted Answer · 2014-07-20T18:22:00

Solution 2

simply do this,use loop if you want the same way you did..

VB

If YourTextBox.Text = "" Or String.IsNullOrEmpty(YourTextBox.Text) Then
            MessageBox.Show("Please Enter Values into YourTextBox")
            txtFileName.Focus()
            Exit Sub
End If

Posted 20-Jul-14 18:22pm

Atyant Srivastava

Updated 20-Jul-14 18:24pm

v2

MukeshSagar · Accepted Answer · 2014-09-08T00:35:00

Use The Code As:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Try
            For Each cntrl As Control In Me.Controls()
                If TypeOf cntrl Is TextBox Then
                    If CType(cntrl, TextBox).Text.Equals(String.Empty) Or (CType(cntrl, TextBox).Text = "") Then
                        MessageBox.Show("Please enter value in " & cntrl.Name.ToString())
                        cntrl.Focus()
                        
                    End If
                End If
            Next
        Catch ex As Exception
 
        End Try
 
    End Sub

MariwanIT · Accepted Answer · 2014-09-08T00:44:00

Solution 6

i am writing in c# you can change it to VB via converter,

for example : TextBox txtName;

if(txtName.Text.Trim().Length == 0)
{

MessageBox.Show("Please Enter Values into txtName");

}

else
{

MessageBox.Show("txtName is not Empty");

}

Posted 8-Sep-14 0:44am

MariwanIT