Textbox min max characters is not working

Question

Hi Guys,

I want to assigan a decimal values betwwel -50 to 50 in the textbox range and if the type any illagal ch or greather than 50..I wnat to show a error message.

My code is not working for both min and max value?? Any help??

			decimal number;
			string value = t_LongitudinalSlopeRadTextBox.Text;
			if (!decimal.TryParse(value, NumberStyles.Any, CultureInfo.InvariantCulture, out number) || number < -50 || number >= 50)
			{
				errorProvider1.SetError(t_LongitudinalSlopeRadTextBox, "Needs to contain decimal numbers");
			}
			else
			{
			    errorProvider1.Clear();
			    errorProvider1.SetError(t_LongitudinalSlopeRadTextBox, "");
			}

Answer 1

I think it is related to commas ands dot. You should define what Culture will use for that. Or use InvariantCulture, in my case if my textbox comes 1.50, it will be 1.5 when parse it, but if it comes 1,50 will be 150 and won't work as well.

---

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Web Developer

Answer 2

HI,

I'm using CultureInfo.InvariantCulture to detect it automatically... Is that correct?

Answer 3

i changed your condition, check this:

decimal number;
string value = textBox3.Text;
if (decimal.TryParse(value, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out number) && (number < -50 || number >= 50) )
{
    MessageBox.Show("Yes, within the range");
}
else
{
    MessageBox.Show("No, invalid number or outside range");
}

In your code, you are checking whether it is a decimal number or not with any value less than -50, or greater than equal 50.

But you can revert back the condition, I changed first check whether it is decimal number and any of the above condition should be fulfilled.

regards

joon

Answer 4

HI,

I'm using CultureInfo.InvariantCulture to detect it automatically... Is that correct?

InvariantCulture doesn't detect anything. What do you want to detect automatically? The current culture? Use CultureInfo.CurrentCulture.

Answer 5

i changed your condition, check this:

decimal number;
string value = textBox3.Text;
if (decimal.TryParse(value, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out number) && (number < -50 || number >= 50) )
{
    MessageBox.Show("Yes, within the range");
}
else
{
    MessageBox.Show("No, invalid number or outside range");
}

In your code, you are checking whether it is a decimal number or not with any value less than -50, or greater than equal 50.

But you can revert back the condition, I changed first check whether it is decimal number and any of the above condition should be fulfilled.

regards

joon

k, i replaced the message box with error provider but it's not working. What should i do??

How can i show red color if there is a wrong value in the textbox?? Thank you

Answer 6

With normal textbox, you can set the color of the text to red or so.

textBox3.ForeColor = Color.Red;

If you wish to have more formatting, you can always use RichTexrBox control.

http://msdn.microsoft.com/en-us/library/aa970779(v=vs.100).aspx

regards

joon

Answer 7

Are you saying that the code Joon84 provided works ok with the messageBox showing when expected.... but the error providers don't?

What exactly is the error that you receive?

Answer 8

When i use this, even if i type 51 or 52 it says "yes, within range".... What is the problem?? 

decimal number;
			string value = t_LongitudeRadTextBox.Text;
			if (decimal.TryParse(value, System.Globalization.NumberStyles.Any, 
				System.Globalization.CultureInfo.InvariantCulture, out number) && (number < -50 || number >= 50))
			{
				MessageBox.Show("Yes, within the range");
				t_LongitudeRadTextBox.ForeColor = Color.Black;
			}
			else
			{
				MessageBox.Show("No, invalid number or outside range");
				t_LongitudeRadTextBox.ForeColor = Color.Red;
			}

Answer 9

Is that because in you first post, you make you statement with a different operator !try.Parse...., and now he is doing without it, just change the order of messageboxes.

---

If you get your question answered, please come back and Mark As Answer.
Web Developer

Answer 10

51 and 52 are larger (or equal) to 50 so the statement returns true.

Try this:

if (decimal.TryParse(value, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out number) && number > -50 && number <= 50 )
{
//
}