TextBox Validation for avoiding redundant entry

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Hi,

I hav 5 textboxes, for entrying emailId's,
i need to have email validation for each textbox and
i should validate the textbox, in such a way that the mailId which i enter in 1st or any other textbox should not repeat in any other text box.

Ex:

TextBox1 :- abc@aa.com
TextBox2 :- abc@bb.com
TextBox3 :- abc@cc.com
TextBox4 :- abc@dd.com
TextBox5 :- abc@aa.com

Here the Textbox1 & Textbox5 are having the same Id, but it should not.
How do i validate in Asp.net.

Regards,
yuva

Posted 21-Sep-11 5:57am

Yuva_r

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OriginalGriff · Accepted Answer · 2011-09-21T06:19:00

Depends on where you are doing it.
If the validation is server side:

C#

List<string> list = new List<string>();
public void RunSnippet()
{
    Add("abc");
    Add("abd");
    Add("abc");
}
void Add(string s)
{
    if (list.Contains(s))
        Console.WriteLine("Exists :" + s);
    else
    {
        list.Add(s);
        Console.WriteLine(s);
    }
}

Will report that "abc" exists the second time.
Remember that you will want these to be case insensitive comparisions!