How to accpet percent and limit user usage.

[thankins]

Does anyone know how to accept percent and decimals in a text box? Also does anyone know how to limit the times a user can input data?

 

Here is a little background about the program i am working on:

 

I need to create an application that calculates and displays payroll for 4 employees. It accepts the following data from the user.

1) Num of hours worked.

2.) Hourly Rate.

3)Precent withheld for Fica.

4)Precent for federal.

5.Percent for State.

 

It then must NOT allow the user to enter anymore data after the 4 employees have been entered!

 

My problem is that I dont know how to allow the user to enter a percent in a textbox or decimal, if they enter either of those the program won't calculate it. But if i enter a whole number it works fine! Also I dont know how to limit the user from entering more then 4 names. I thought about using a Do While loop by but didnt know where to place it.

 

Here is my code

Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
       End

   End Sub

   Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
       txtState.Text = " "
       txtFederal.Text = " "
       txtFica.Text = " "
       txtHours.Text = " "
       txtRate.Text = " "
       txtName.Text = " "
       lstOutput.Items.Clear()
       txtName.Focus()

   End Sub

   Private Sub txtHours_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtHours.Validating
       'Vaildates that a number has been entered into the text box

       If Not IsNumeric(txtHours.Text) Then
           MessageBox.Show("Hours worked must be a number.", "Invaild Input", MessageBoxButtons.OK, _
           MessageBoxIcon.Error)

           'Select the existing text in the text box.
           txtHours.SelectionStart = 0
           txtHours.SelectionLength = txtHours.Text.Length
           'Set the e.Cacel to true so the focus will stay in the control
           e.Cancel = True
       Else
           e.Cancel = False
       End If
   End Sub


   Private Sub txtRate_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtRate.Validating
       'Vaildates that a number has been entered into the text box

       If Not IsNumeric(txtRate.Text) Then
           MessageBox.Show("Pay Rate must be a number.", "Invaild Input", MessageBoxButtons.OK, _
           MessageBoxIcon.Error)

           'Select the existing text in the text box.
           txtRate.SelectionStart = 0
           txtRate.SelectionLength = txtRate.Text.Length
           'Set the e.Cacel to true so the focus will stay in the control
           e.Cancel = True
       Else
           e.Cancel = False
       End If
   End Sub

   Private Sub txtState_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtState.Validating
       'Vaildates that a number has been entered into the text box

       If Not IsNumeric(txtState.Text) Then
           MessageBox.Show("State taxes must be a number.", "Invaild Input", MessageBoxButtons.OK, _
           MessageBoxIcon.Error)

           'Select the existing text in the text box.
           txtState.SelectionStart = 0
           txtState.SelectionLength = txtState.Text.Length
           'Set the e.Cacel to true so the focus will stay in the control
           e.Cancel = True
       Else
           e.Cancel = False
       End If
   End Sub

   Private Sub txtFederal_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtFederal.Validating
       'Vaildates that a number has been entered into the text box

       If Not IsNumeric(txtFederal.Text) Then
           MessageBox.Show("Federal taxes must be a number.", "Invaild Input", MessageBoxButtons.OK, _
           MessageBoxIcon.Error)

           'Select the existing text in the text box.
           txtFederal.SelectionStart = 0
           txtFederal.SelectionLength = txtFederal.Text.Length
           'Set the e.Cacel to true so the focus will stay in the control
           e.Cancel = True
       Else
           e.Cancel = False
       End If
   End Sub

   Private Sub txtFica_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtFica.Validating
       'Vaildates that a number has been entered into the text box

       If Not IsNumeric(txtFica.Text) Then
           MessageBox.Show("F.I.C.A. withholdings must be a number.", "Invaild Input", MessageBoxButtons.OK, _
           MessageBoxIcon.Error)

           'Select the existing text in the text box.
           txtFica.SelectionStart = 0
           txtFica.SelectionLength = txtFica.Text.Length
           'Set the e.Cacel to true so the focus will stay in the control
           e.Cancel = True
       Else
           e.Cancel = False
       End If
   End Sub

   Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
       'Declares local variables for btnCalculate_Click Method
       Dim empName As String
       Dim hrRate, hrsWorked As Single
       Dim stateTax, fedTax As Single
       Dim totalPay, grossPay, ficaTax As Single

       'Gets data,compute payroll,display results

       Call InputData(empName, hrRate, hrsWorked, fedTax, ficaTax, stateTax)
       grossPay = Gross_Pay(hrRate, hrsWorked)
       fedTax = Fed_Tax(grossPay, fedTax)
       ficaTax = Fica_Tax(grossPay, ficaTax)
       stateTax = State_Tax(grossPay, stateTax)
       totalPay = CSng(Total_Pay(grossPay, ficaTax, fedTax, stateTax))
       Call ShowPayroll(empName, grossPay, totalPay, ficaTax, fedTax, stateTax)

   End Sub
   Sub InputData(ByRef empName As String, ByRef hrRate As Single, ByRef hrsWorked As Single, ByRef fedTax As Single, ByRef ficaTax As Single, ByRef stateTax As Single)

       ' Get payroll data for employee
       empName = txtName.Text
       hrRate = CInt(txtRate.Text)
       hrsWorked = CInt(txtHours.Text)
       fedTax = CSng(txtFederal.Text)
       ficaTax = CSng(txtFica.Text)
       stateTax = CSng(txtState.Text)


   End Sub

   Sub ShowPayroll(ByRef empName As String, ByRef pay As Single, ByRef totalPay As Single, ByRef ficaTax As Single, ByRef fedTax As Single, ByVal stateTax As Single)
       ' Payroll output for listbox
       
       lstOutput.Items.Add("Payroll results for " + (empName))
       lstOutput.Items.Add("     Gross pay this period:" + FormatCurrency(pay))
       lstOutput.Items.Add("     F.I.C.A. tax withheld:" + FormatCurrency(ficaTax))
       lstOutput.Items.Add("     Federal Income tax withheld:" + FormatCurrency(fedTax))
       lstOutput.Items.Add("     State Income tax withheld:" + FormatCurrency(stateTax))
       lstOutput.Items.Add("     Net pay:" + FormatCurrency(totalPay))
   End Sub

   Function Gross_Pay(ByRef hrWage As Single, ByRef hrsWorked As Single) As Single
       ' Compute weekly pay before taxes
       If hrsWorked <= 40 Then
           Gross_Pay = hrsWorked * hrWage
       Else
           Gross_Pay = CSng(40 * hrWage + (hrsWorked - 40) * 1.5 * hrWage)
       End If
   End Function

   Function Total_Pay(ByRef grossPay As Single, ByRef ficaTax As Single, ByRef fedTax As Single, ByRef stateTax As Single) As String
       ' Compute amount of net pay
       Total_Pay = CStr(grossPay - ficaTax - fedTax - stateTax)
   End Function

   Function Fed_Tax(ByRef grossPay As Single, ByRef fedTax As Single) As Single
       'Compute amount to be taken for Federal Tax
       Fed_Tax = grossPay * fedTax


   End Function

   Function Fica_Tax(ByRef grossPay As Single, ByRef ficaTax As Single) As Single
       ''Compute amount to be taken for FICA Tax
       Fica_Tax = grossPay * ficaTax


   End Function

   Function State_Tax(ByRef grossPay As Single, ByRef stateTax As Single) As Single
       'Compute amount to be taken for State Tax
       State_Tax = grossPay * stateTax

   End Function

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

   End Sub
End Class

[aewarnick]

To convert any variable to a string either put +"" after it or ToString()

 

To limit the amout of times a user inputs data, use a couple global variables along with the TextChanged event. When the user starts typing set a bool variable to true and then in a buttonClick event or whatever you are using for the user to submit one box check if the bool variable is true, set it back to false, then increment a global counter variable: ++count.