Comments on: Check If User Name Exists Using AJAX And C#

By: 5 Practical Ways Using Ajax | M3 Printing

5 Practical Ways Using Ajax | M3 Printing — Sat, 06 Feb 2010 07:17:59 +0000

[...] Check If User Name Exists Using AJAX And C# [...]

By: Pattern Inc » 5 Practical Ways Using Ajax

Pattern Inc » 5 Practical Ways Using Ajax — Wed, 03 Feb 2010 11:25:56 +0000

[...] Check If User Name Exists Using AJAX And C# [...]

By: ScriptoX

ScriptoX — Sat, 05 Dec 2009 19:10:17 +0000

Excellent post..Keep them coming Thanks for sharing.

By: Hesham

Hesham — Tue, 25 Aug 2009 11:41:08 +0000

I am not deep into programing, but I like your blog and your helpful posts!

By: Adam

Adam — Tue, 28 Jul 2009 02:19:26 +0000

I’ve taken the liberty of making it work.
protected void Page_Load(object sender, EventArgs e)
{
string newUsername = Request.QueryString["q"];

int found=0;

for(int i=0;i if(usernames[i].Equals(newUsername)){
found=1;
}
}
if (found==1)
{
literal1.Text = "User name exists";
}
else
{
literal1.Text = "OK";
}

}

By: Adam

Adam — Tue, 28 Jul 2009 02:11:19 +0000

“if(usernames.Contains(newUsername)) ”
Where Usernames an simply an array? Can one do that in C# i’m not seeing that method.

By: sangam uprety

sangam uprety — Mon, 18 May 2009 06:20:25 +0000

Thanks for the post.
The same implementation could be observed from here also: http://dotnetspidor.blogspot.com/2009/03/check-username-availability-using.html

By: John

John — Tue, 28 Apr 2009 04:32:16 +0000

Why not use HttpHandler for server side checking..Use JQuery/JSON it will be very easy..
Example:
http://www.codedigest.com/Articles/jQuery/224_Building_Cascading_DropDownList_in_ASPNet_Using_jQuery_and_JSON.aspx

By: Amgad Suliman

Amgad Suliman — Mon, 27 Apr 2009 07:06:23 +0000

I wanted to keep this post simple, that’s why I didn’t use web service. I didn’t think of using HTTPHandler instead of an ASPX page, that’s an interesting thing to try. Thanks Jonathan.

By: Jonathan Holland

Jonathan Holland — Sun, 26 Apr 2009 19:00:26 +0000

I would suggest not using an ASPX page for your ajax callback handler and instead look at using a HTTPHandler. These are much lighter weight.

Another neat trick is that you could also use a ASP.NET WebService and have it wire up the JS automatically. If you did this, you could call the C# method from your JS without having to write any code.