How to show User Already Exists in DATABASE ?

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Dear All ,

Have a good Day !! My project is based upon Asp.net,c#,SqlServer 2005.

I have Registration form i which i have Fields as,

FirstName, LastName,UserName, Password etc etc.

So, when the user fill ups this Form, when he is entering Username. It should check automatically that this username Exists or not. when user is entering in textbox , it should check the database.and displays a message in label.

if its already exists in Database, it must show already exists(Someone already choosed, Try another)

Please give me good solution for this problem.

Thanks.

Posted 8-Jul-12 23:53pm

Ubaid ur Rahman IT

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4 solutions

Solution 2

Plz go through this link. Here webservice call is on button click. Instead use it in textbox onblur event.
How to call a Web Service from client-side JavaScript using ASP.NET AJAX

Posted 9-Jul-12 0:05am

pradiprenushe

Solution 3

Checking User is present in Db or Not

Select Usenname from Users ;
Then Compare With User entered Username with Db UserName
Like This

C#

Sqlconnection con=new sqlconnection(Your connection string);
Sqldataadapter da=new Sqldataadapter("Select Usenname from Users",con);
dataset ds=new dataset();
if(textbox1.text==ds.tables[0].rows[0][0].tostring())
{
lblmsg.Text="Please Choose another User"
}
else
{
//Proceed

}

Posted 9-Jul-12 0:09am

vangapally Naveen Kumar

Comments

samlee69 21-Sep-16 3:22am

where should i put this code at page load or at onclick event?????????

Solution 4

You may try this for Check username availability on TextBox onblur event.

http://www.aspdotnet-suresh.com/2011/03/how-to-check-username-availability.html[^]

http://riderdesign.com/articles/Check-username-availability-with-ASP.NET-AJAX.aspx[^]

Posted 9-Jul-12 0:12am

Sanjay Kunjam

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Manas Bhardwaj · Accepted Answer · 2012-07-08T23:57:00

Solution 1

Any efforts? This has been do so many times and internet is full of examples of it.
Microsoft even ships the Login Control with so that you don't have do it all over again. Look at the following links:

http://msdn.microsoft.com/en-us/library/ms178329.aspx[^]

http://www.asp.net/web-forms/tutorials/security/membership/creating-user-accounts-cs[^]

http://geekswithblogs.net/dotNETvinz/archive/2009/04/30/creating-a-simple-registration-form-in-asp.net.aspx[^]

Posted 8-Jul-12 23:57pm

Manas Bhardwaj

Comments

Shahin Khorshidnia 9-Jul-12 5:59am

+5 And a simple way: Select * from [User] where UserName = 'The user Name'

Ubaid ur Rahman IT 9-Jul-12 6:03am

Boss, I need to check the Users Check Availability from Database, whether its Exists of not.

Please help me.

Thanks.

vangapally Naveen Kumar 9-Jul-12 6:03am

Good Links

Prasad_Kulkarni 16-Jul-12 23:59pm

Good references +5!