How to check username availability

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Hi,
I'm new to asp.net. I'm designing a new login form that takes username and password.I also have a register option and how can I write my code so that It checks weather the username available or not. I'm using SQL server and C#.

Posted 1-Dec-14 20:42pm

Member 11239022

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Sergey Alexandrovich Kryukov 2-Dec-14 2:51am

What do you mean "how"? By executing appropriate SQL query, according to your database schema. Where did you stuck?
—SA

syed shanu 2-Dec-14 2:56am

Check this links ,This will help you to solve your problem.

http://www.mikesdotnetting.com/article/75/simple-login-and-redirect-for-asp-net-and-access

http://www.aspsnippets.com/Articles/Simple-User-Login-Form-example-in-ASPNet.aspx

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Er. Dinesh Sharma · Answer 1 · 2014-12-01T20:59:00

Solution 1

You Can use sql Stored Proc.

SQL

Create proc_UserNameExist
@UserName as Varchar(50)
as
declare @Count int

select @Count=Count(*) from tblUser where userName=@UserName
if(@Count>0)
begin
---User Found
end
else
begin
---User Not Found
end

Posted 1-Dec-14 20:59pm

Er. Dinesh Sharma

Member 10889447 · Answer 2 · 2014-12-01T21:03:00

web.Config // Connect to database

XML

<connectionStrings>
<add name="dbconnection" connectionString="Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB"/>
</connectionStrings>

//Action Your Button

protected void btnSubmit_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand("select * from UserInformation where UserName =@username and Password=@password",con);
cmd.Parameters.AddWithValue("@username", txtUserName.Text);
cmd.Parameters.AddWithValue("@password", txtPWD.Text);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
if(dt.Rows.Count>0)
{
Response.Redirect("Details.aspx");
}
else
{
ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Invalid Username and Password')</script>");
}
}

If you using Sql Server Authentication, you add UserId="" and Password="" in Web.Config

King Fisher · Answer 3 · 2014-12-01T21:05:00

Solution 4

i hope you are looking for this :

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

Posted 1-Dec-14 21:05pm

King Fisher