[RESOLVED] “Invaid Cast Exception” - ??????

I am trying to get a progressbar to display smoothly here is my code which causes an error “Invaid Cast Exception”

Code:

---

If ADN > 100 + (Rate) And ADN <= 100 + (Rate * 2) Then
            ProgressBar1.Visible = True
            ProgressBar1.Minimum = 0
            ProgressBar1.Maximum = 1000
            ProgressBar1.Minimum = 100 + (Rate)
            ProgressBar1.Maximum = ((100 + (Rate * 2)))
            ProgressBar1.Value = Format((ADN / ProgressBar1.Maximum), "###0%")
        Else
End If

---

The values that cause this error are ADN = 105.49148819330023 and Progressbar1.Maximum =106
Progressbar1.Miniumum = 103

Now as you can see these numbers are very nearly the same which is why I am using the % to spread the values displayed by the progressbar from 0-100 to give some resolution to the display, as the progressbar values by default only step in 1's. :confused:

Hi,
the value property of the progress bar will only take an integer - you can't format it like that, i.e. using a % sign

Pete

Just use ADN\ProgressBar1.Maximum if ADN is greater than ProgressBar1.Maximum. That will do a simple integer division. Not as precise, but since the value can only handle integers, it makes little difference.

I have changed it to

ProgressBar1.Value = ((ADN / ProgressBar1.Maximum) * 100)

And now I get this errror:

System.ArgumentException was unhandled
Message="An error message cannot be displayed because an optional resource assembly containing it cannot be found"
StackTrace:
at Microsoft.AGL.Common.MISC.HandleAr()
at System.Windows.Forms.ProgressBar._SetInfo()
at System.Windows.Forms.ProgressBar.set_Value()
at Mx.Form1.AIR()
at Mx.Form1.VScrollBar3_ValueChanged_3()
at System.Windows.Forms.ScrollBar.OnValueChanged()
at System.Windows.Forms.ScrollBar.WnProc()
at System.Windows.Forms.Control._InternalWnProc()
at Microsoft.AGL.Forms.CTL.ScrollBarSetInfo()
at System.Windows.Forms.ScrollBar._SetInfo()
at System.Windows.Forms.ScrollBar.set_Value()
at Mx.Form1.InitializeComponent()
at Mx.Form1..ctor()
at System.Reflection.RuntimeConstructorInfo.InternalInvoke()
at System.Reflection.RuntimeConstructorInfo.Invoke()
at System.Reflection.ConstructorInfo.Invoke()
at System.Activator.CreateInstance()
at MyForms.Create__Instance__()
at MyForms.get_Form1()
at Mx.Form1.Main()

What on earth is going on?

Hi,
why do you set the minimum to 0, the max to 1000, and then immediately change them?

Not saying that explains the error, but...

Put a try catch around it and check the error message

Pete

Pete
The reason for this is I was getting an error when setting the max and min with the code so I set at a level that will always be bigger and then just re-set inside those limits. However if I take those away I still get the same error.

Let me try to explain what I am trying to do. My problem is that the Max value is likely to be say 105 and the min value say 103 and the actual value say 103.998765345 Now if I just use those values I get a very choppy display on the progress bar as it only moves in increments of whole 1’s then it will only display 103,104 and 105 values, were as if I calculate the percentage value then I will get (if it worked) a progress bar value from 0-100 as the actual values changed from 103 to 105 instead of what I get now is just 3 big steps :confused:

If the actual values are 103 and 105 then you're making your life more difficult by using Maximum and Minimum values of 0 and 100. If you want finer granularity then simply multiply the ACTUAL values by a factor, e.g.

ScaleFactor = 100
Minimum = 103 * ScaleFactor
Maximum = 105 * ScaleFactor
Value = CInt(Math.Floor(ADN * ScaleFactor))

If you want finer granularity again then use a larger scale factor.

Brilliant, it works just as I wanted it to!

Many Thanks