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Insert one label for the refractive index “n= “. To edit the text inside the label go to properties and look for “Text” and type in the desired name. Add seven Text Boxes for each value (it‟s where the user types in the experimental values and where the final values will be displayed). Add four labels to display the measurement units. Add four buttons placed like in Figure 4. They will be used to calculate the data (Calculate button), save the data (Save button), reset the fields (Reset button) or to return to the main page (Main page button).To edit the names of the buttons we use the same technique previously used on the window title, which is by editing its properties. Figure 4. The buttons of the GUI 2.2 Writing the software code Writing the code is, sometimes, the tricky part. We have to write code lines for the buttons and the errors that will be displayed if the user commits a mistake [11, 13]. We start by declaring some variables at the beginning of the page. First double click on the first button to get to the coding page. Above “Public Class minimum_dev” write: Option Explicit On Option Strict Off Below it write: Inherits System.Windows.Forms.Form We‟ll need these lines mainly for exporting the data into the excel table [11, 13]. Below “Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click” we write the code that‟ll calculate the values. Because our value is an angle and it‟s limited between 30 and 50 degrees, we have to add a condition that‟ll check if the value typed in by the user corresponds to the experimental data. How will the program check for errors First it checks the field not to be empty. If it is empty, then an error will be displayed. If it‟s not empty it moves on to the next condition which is the angle‟s value. If it‟s not in the interval another error message will be displayed (Figure 5). If everything is ok it will move on and calculate the values. Next, after checking for any possible errors we move on to the codes that calculate and display the values. We write them below the error lines [12].
Figure 5. Displaying error message If TextBox1.Text = Nothing Then MsgBox("Please type in a value for δmin!", MsgBoxStyle.Exclamation, "Error") ElseIf TextBox1.Text < 30 Or TextBox1.Text > 50 Then MsgBox("δmin cannot be above 50 or below 30 degrees!", MsgBoxStyle.Exclamation, "Error") ElseTextBox2.Text = (TextBox1.Text + 60) / 2 TextBox3.Text = 0.01745 * ((TextBox1.Text + 60) / 2) TextBox4.Text = Math.Sin(0.01745 * ((TextBox1.Text + 60) / 2)) TextBox5.Text = "0.5235" TextBox6.Text = "0.5000" TextBox7.Text = (Math.Sin(0.01745 * ((TextBox1.Text + 60) / 2))) / 0.5 End If All these lines are for calculating the values, for the first button. The reset button will have no errors to check and will be easier to write. All it does is wiping the data written in the text boxes. Double click on the “Reset” button. It will take you to the coding page. We write the reset code between “Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click” and the line below it (which is where the code for this button ends) “End Sub” The code is like this: TextBox1.Text = Nothing TextBox2.Text = Nothing TextBox3.Text = Nothing TextBox4.Text = Nothing TextBox5.Text = Nothing TextBox6.Text = Nothing TextBox7.Text = Nothing Like we said all it does is wiping the values in the Text Boxes. After typing in those lines the code for the Reset button should be like this [12]: Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click TextBox1.Text = Nothing TextBox2.Text = Nothing
Page 1 and 2: THE INTEGRATION OF VISUAL BASIC PRO
Page 3: Figure 2. The properties window. Th
Page 7 and 8: Figure 8. The final interface of th

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