I want to enter only Negative values,Positive values,Decimal values in TextBox

[g_hemanth17]

Hi friends, I am using C# in windows based application and i am using one text box in which i want to validate the text box when user enters any Positive Values(+),Negative Values(-) and Decimal Values(.)(only Numeric Values).Can any one send me the code for validating the text box in windows based application using C#.

hemanth@919866357142

[Christian Graus]

There's at least one article on this site that does that, there's also the maskedtextbox if you prefer. You just handle the keypress event, and set it's handled property to reject keys you don't want. Don't forget to check for Char.IsControl.

Christian Graus - Microsoft MVP - C++ "also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

[Xmen Real]

Why dont you use "NumericUpDown" control, its what, you want from a textbox

Becoming Programmer...

[g_hemanth17]

Thanks xmen_xwk for your message..but i cannot use NumericUpDown Control here because i want to enter any value in the text box(negative,Positive,Decimal Values from 1 to.... so i cannot specify all these numbers in the NumericUpDown control)..

hemanth

[Sri_3464]

Use the code below. Pass the textbox.Text to this method from the validating or validated or leave event of the textbox public bool IsNumeric(object expression) { double retNum; return Double.TryParse(Convert.ToString(expression), System.Globalization.NumberStyles.Integer,System.Globalization.NumberFormatInfo.InvariantInfo,out retNum ); }

Thanks, Srikanth

[g_hemanth17]

Thanks Srikanth for your code.i tryed it but i didn't get the correct result from your code.can u send me the project file which you did to my mail id .I will check it out..my mail id is g.hemanth17@gmail.com

Thanks,Hemanth

[Xmen Real]

buddy you can also write any value in NumericUpDown

Becoming Programmer...

[shaz jazz]

hi! i have used this chunk of code for taking only positive decimal and interger values, it worked successfully for me. you can modify it according to your need. it is basically keypress event of textbox... private void onKeyPress(object sender, KeyPressEventArgs e) { char[] myNum = new char[12] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '\b','.' }; bool blnNumFnd = false; //for keeping track of decimal foreach (char c in myNum) { if (e.KeyChar == myNum[11]) { String txt = ((TextBox)sender).Text; if (!txt.Contains(".")) { blnNumFnd = true; //means its decimal value and user can't enter another decimal again! break; } } else if (e.KeyChar == c) { blnNumFnd = true; break; } } if (!blnNumFnd) e.KeyChar = '\0'; } hope it will work for you!

Regards, shazjazz

[g_hemanth17]

Thank you shazjazz..its helped me out...

hemanth

[g_hemanth17]

Hi Shanjazz can u send me the code for entering Positive values and negative values also..i tryed by changing the code but i didn't get the result correctly.I am waiting for your code for entering Negetive,Positive,Decimal values in textbox

hemanth