validate string for special characters

[iramg]

in a textbox when user enter some input after that i want to check wether user enter only alphanumeric values or any special char like *&$@!":. if user does i will inform the user that input string is not valid my question is how i will find out that user has entered special char. reply soon

[Sean89]

string input = textBox.Text;

if(!input.Contains("@"))
{
// do stuff
}

Does that help?

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[iramg]

so for all special char i have to check seprately. is there is any method to check all of them at once or user would be not able to enter special char thanks

[Not Active]

Use a regular expression

only two letters away from being an asset

[Ennis Ray Lynch Jr]

Override the text box and overrid the following method protected override bool ProcessKeyMessage(ref Message m); There are other ways as well but this one is fairly simple.

A man said to the universe: "Sir I exist!" "However," replied the Universe, "The fact has not created in me A sense of obligation." -- Stephen Crane