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vb.netvariables
Abbas1999
Abbas1999

Reputation: 395

Recognize Variable Globally in VB.NET

How to Recognize Variable Globally in VB.NET? I have the code below, my problem is that VB.NET does not recognize the variables "Z_lenght" and "Z_width" outside the IF Statement (i.e. after ENDIF).

    Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        If TextBox1.Text > TextBox2.Text Then
            Dim Z_lenght = TextBox1.Text
            Dim Z_width = TextBox2.Text
        Else
            Dim Z_lenght = TextBox2.Text
            Dim Z_width = TextBox1.Text
        End If

        Dim Z_area = Z_lenght * Z_width
        RichTextBox1.AppendText("Length = " & Z_lenght)
        RichTextBox1.AppendText("Width = " & Z_width)
        RichTextBox1.AppendText("Area = " & Z_area)
    End Sub

End Class

I appreciate any help/comment.

Upvotes: 0

Views: 130

Answers (2)

Codemunkeee
Codemunkeee

Reputation: 1613

Public Class Form1
    Dim Z_length As Double = 0
    Dim Z_width As Double = 0
    Dim Z_area As Double = 0
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        If TextBox1.Text > TextBox2.Text Then
            ' I don't know what you're trying to achieve here, 
            ' but I recommend try using Double.TryParse()
            Double.TryParse(TextBox1.Text, Z_length)
            Double.TryParse(TextBox2.Text, Z_width)
        Else
            Double.TryParse(TextBox2.Text, Z_length)
            Double.TryParse(TextBox1.Text, Z_width)
        End If

        Z_area = Z_length * Z_width
        RichTextBox1.AppendText("Length = " & Z_length)
        RichTextBox1.AppendText("Width = " & Z_width)
        RichTextBox1.AppendText("Area = " & Z_area)
    End Sub

End Class

This will make Z_Length, Z_width and Z_area usable in class Form1

Upvotes: 2

DeveloperGuo
DeveloperGuo

Reputation: 636

declare your variables outside of the if else scope.

http://msdn.microsoft.com/en-us/library/1t0wsc67.aspx

If you declare a variable within a block, you can use it only within that block. In the following example, the scope of the integer variable cube is the block between If and End If, and you can no longer refer to cube when execution passes out of the block.

Given your comments, it seems you should review variable scopes. You can use your variables outside your if-else inside your if-else.

Upvotes: 0

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