Why it is producing the error "expression required"?

Question

Public Class WinApp

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    End Sub

    Private Sub buttonSubmit_Click(sender As Object, e As EventArgs) Handles buttonSubmit.Click
        MessageBox.Show("Hello" + ' ' + "how are you");
    End Sub
End Class

#suji, I'm getting the error 'expression required' by the + operator — user2460539, Aug 05 '15 at 05:35
The correct vb.net code would be: `MessageBox.Show("Hello" + " " + "how are you")` — Pradeep Kumar, Aug 05 '15 at 05:35
@Pradeep Kumar: No, the correct VB.NET code would be: `MessageBox.Show("Hello" & " " & "how are you")`. `+` is recommended to _not_ be used as it's only made for integers. See: http://stackoverflow.com/a/734631/3740093 — Visual Vincent, Aug 05 '15 at 09:33
@Visual Vincent, The view expressed in that post may be personal opinion of the author. It doesn't matter whether you use + or & for string concatenation. However best practices include using `OPTION STRICT ON` that would take care of the concerns expressed in that post. — Pradeep Kumar, Aug 05 '15 at 09:40
@Pradeep Kumar: The `+` will convert the strings into integers before concatenating them anyway. So I guess you're right. It really doesn't matter as long as you don't want to concatenate integers as strings and described in the post. _But I'd recommend to use the `&` concatenation operator._ — Visual Vincent, Aug 05 '15 at 09:45
@VisualVincent - The `+` operator will most certainly _not_ convert the strings to integers in that code. It may well attempt to convert the string to an integer if an integer is included in the expressions, e. g. `"Hello" + 4`. But `Option Strict On` should catch this, but I agree with you that for string concatenation the `&` operator should be used. — Chris Dunaway, Aug 05 '15 at 14:01

score 0 · Answer 1 · answered Aug 05 '15 at 05:36

In order to run app in c# open the c# application . You are opening vb.net project and asking c# code :) Actual code for concatenate is given below in c#

 private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Hello" + ' ' + "how are you");
        }

score 0 · Answer 2 · answered Aug 06 '15 at 10:06

0

MessageBox.Show("Hello" + " " + "how are you") is the VB.net code .. you're mixing it with some other code C# or C++ code etc.

answered Aug 06 '15 at 10:06

Pretty_Girl

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Why it is producing the error "expression required"?

2 Answers2