Restricting input in TextBox

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I have created a form in Visual Studio 2008 in c# file.
In that form I have a text box for the field e-mail ID.

I want that text box to show some default site ID like @yahoo.com, @gmail.com, @rediffmail.com etc. when entering the e-mail ID of the person.

For example my e-mail ID is [deleted]@gmail.com and if I am entering my e-mail ID [delete]@ after entering the @ symbol the default mail ID should be shown and the text field should not allow the data to be stored unless the @ symbol is mentioned in the text field.

[edit]DON'T SHOUT! It is considered rude - converted to normal case. Don't post your email to any forum, unless you really like spam. General tidy and spelling. Tags. OriginalGriff[/edit]

Posted 18-Aug-10 21:28pm

SELVARAJSRINIVAS

Updated 18-Aug-10 22:13pm

Dalek Dave

v3

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Hariarjunan · Answer 1 · 2010-08-18T21:53:00

Dear Selva,

The following is very useful for you.

private void textBox1_KeyUp(object sender, KeyEventArgs e)
{
if (textBox1.Text.IndexOf("@") > 0)
{
listBox1.Visible = true;
if (textBox1.Text.IndexOf("@") != textBox1.Text.Length)
{
string searchTxt = textBox1.Text.Substring(textBox1.Text.IndexOf("@"));
for (int i = 0; i < listBox1.Items.Count; i++)
{
if (listBox1.Items[i].ToString().Contains(searchTxt))
{
listBox1.SelectedIndex = i;
break;
}
}
}
}
else
{
listBox1.Visible = false;
}
}

Regards,
Hariharan

vikram_bullet · Answer 2 · 2010-08-19T09:15:00

Hi Selva

In the textbox leave or validating event you can check..

whether

textbox.text.Indexof("@");
or use regex like
regex rex = new regex(".*@.*");

use regex property match which returns a bool to verify whether the text as an instance of '@' or not..

And depending on the result you can display an error message or whatever.

Hope this gives you an idea..

AspDotNetDev · Answer 3 · 2010-08-19T09:37:00

Solution 3

User Input Validation in Windows Forms

You can use the text changed event (I think that's what it's called) to check if the @ was entered.

That assumes you are not working with ASP.Net.

Posted 19-Aug-10 9:37am

AspDotNetDev

Restricting input in TextBox

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