how to identify a duplicate key at insertion

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SQL-Server-2005

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hi...
i have inserted already some datas...
i am going to register a new user...
but i given same user name which is already inserted...
but the user name is the primary key.. so it show doesn't allows duplicate key....
how can i intimate at the textbox changed position?
is it possible to say that "please choose another username because its already chosen"...

Posted 4-Nov-11 20:16pm

Raghupathiraja

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Menon Santosh · Accepted Answer · 2011-11-04T20:21:00

Solution 1

it is easy task

use this query before inserting into table

select count(*) from yourusertable where userid='userid'

if Query return is greater than zero then user already exists :)

Posted 4-Nov-11 20:21pm

Menon Santosh

Comments

Raghupathiraja 5-Nov-11 2:25am

thank... when the control moves to next textbox... there itself i want to do this process...

RaisKazi · Accepted Answer · 2011-11-04T20:30:00

Solution 2

Further to above Answer, You can do validation on onchange Event of your TextBox using Ajax.

ASP.NET

<asp:textbox id="txtName" runat="server" onchange="javascript: Test();" />

You can refer my Tip/Trick for "Asp.Net Ajax".
Simplifying-Asp-Net-Core-Ajax

Updated - Or use onblur JavaScript Event.

ASP.NET

<asp:textbox id="txtName" runat="server" onblur="javascript: Test();" />

Posted 4-Nov-11 20:30pm

RaisKazi

Updated 4-Nov-11 20:46pm

v2

Comments

Raghupathiraja 5-Nov-11 2:38am

i can't get this...

RaisKazi 5-Nov-11 2:44am

Ok. Lets go Step by Step.
1) You want to do validation of UserId whenever User change it.
2) Now Events by which you will come to know User is changing/changed UserId are Javascript Events - Either use onblur/onchange.
3) But your validation code requires server-side(code-behind).
4) If you refref my Tip/Trick link, in that I have demonstrated how you can call server-side(code-behind) from JavaScript Events.

Hope this helps. :)