Web Forms :: UserName Exist In Database Or Not?
Jun 9, 2010
How to check wether username exist in database or not in my regestration page? and plus i want to implement this feature also...suppose i allowed one user to select username as 'user01' and that user is still completing his form and same time another user tries to check whether 'user01' exist in database or not then i should show user as that 'user01' is not available for him and he should try to select some other username for him...
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May 7, 2015
How to check username is exist in database or not without postback the page...
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Mar 24, 2010
This is the code when you take the Login control from the toolbox.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> [code]....
Error 1 The name 'UserName' does not exist in the current context
Error 2 The name 'Password' does not exist in the current context
Error 3 'ASP.default_aspx' does not contain a definition for 'Login1_Authenticate' and no extension method 'Login1_Authenticate' accepting a first argument of type 'ASP.default_aspx' could be found (are you missing a using directive or an assembly reference?)
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Aug 15, 2012
I have dropdown list in my page
BindDropDownList(DdlDistrict, "District1", "District", "ID");
DdlDistrict.Items.Insert(0, new ListItem("select district", "0"));
And I use this code for binding from databaseÂ
DdlDistrict.Items.FindByText(_dr["District"].ToString()).Selected = true;
Here if in database have value it show in ddldistrictÂ
Now I want if there wasn't any thing in database in dropdown list show  "select district"  that i define hereÂ
DdlDistrict.Items.Insert(0, new ListItem("select district", "0"));Â
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Sep 15, 2010
i have login page. how check username and password store in database . plz reply with code.
i did it by form authentication b ut it not work.
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Apr 30, 2010
how to check if a particular data in the database already, for example, i want to check if a username already exist in database, then the user cant choose that username.
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Jun 29, 2012
I'm currently doing sign up page where customer can sign up to use my website.however, when they type username, they will prompt that username is taken.how to check in database if the username is already been taken? i got 2 sign up page. 1st page is where the customer type their username, and password.2nd page is where they type thier personal particulars and then it will store in database..
below are my codes fot my 1st page
protected void btnNext_Click(object sender, EventArgs e)Â {Â
if (!Page.IsValid)Â {Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
return;Â Â Â Â Â Â Â Â Â Â Â
}Â Session["username"] = tbNewId.Text;Â Â
Session["password"] = tbConfirmPassword.Text;Â
Response.Redirect("~/SignUp2.aspx");Â Â Â Â Â }
this is my codes for second page
protected void btnNext_Click(object sender, EventArgs e) {
SqlConnection con = new SqlConnection();
con.ConnectionString = ConfigurationManager.ConnectionStrings["Connection"].ConnectionString;
String sql = "Insert into Customer (Name, Phone, Email, Address, Username, Password) ";
sql = sql + "Values (@Name, @Phone, @Email, @Address, @Username, @Password)";
[code]....
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Jul 30, 2012
In this article u describe how to check
[URL]
But I want to Data retrive from data base in this way can u tell me using java script and query string
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May 7, 2015
I am using asp.net website , now when a user creates new account his password must be saved in hashes , or gets encrypted and submits in database , next time when he login , my application fetch password from encrypted field , then decrypt it and match with the user entered password , if that's ok , page will be redirected to some other pages ... how to do that task ??
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Dec 15, 2010
I have a gridview on a page that allows a user to edit the data. I need to be able to insert the current user's username in the database table whenever they click update on the gridview. I am new to coding and im strugling to get this project done.I am using MSSQL Server 2005 and VB in the codebehind.
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Apr 29, 2010
I am using ASP.NET Forms Authentication for my application. I have made my Password Format "Clear", so no problems with the password encryption. I need to create a view(in SQL server) to display all Administrators in my System. ie aspnet_Roles.LoweredRoleName='administrator' The fields needed are UserName and Password
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Jul 13, 2010
Before a subscription to a newsletter and the record will be inserted, i'd like to check if the record already exist ina sql-server database. This what i've got as dusfar
adres = TxtEmail.Text
DBConn.Open()
If adres <> "" Then
Try
DBCmd = New SqlCommand("SELECT COUNT(*) FROM TBL_Subscribers WHERE email = @adres)", DBConn)
''Add
DBCmd.Parameters.Add("@Email", SqlDbType.NVarChar).Value = adres
DBCmd.ExecuteScalar()
DBAdap = New SqlDataAdapter("SELECT * FROM TBL_Subscribers ORDER BY ActivateDate", DBConn)
DBAdap.Fill(DS)
Catch exp As Exception
Response.Write(exp)
End Try
End if
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Jan 10, 2011
I am trying to locally install a CMS for my website. During this installation process, it shows me an error "User or role does not exist in the database. Screenshot of the error: Here's the screenshot of the login properties from Management Studio (Properties of the user Sarin)
Screenshot shwoing the database user properties: [URL] User mapping: Screenshot: [URL]
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Apr 19, 2010
I have developed an asp.net application ... I have a textbox where user will enter is name ... I need to check if the name is already exist in the database table column when ever user enter their name with out post back . If user exist mean it should show a msg user already exist .....
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Dec 3, 2010
I have a GridView on a page for maintainance of the database (mdf). Under this GridView1 I have a FormView1 where I use the ItemInsertTemplate to Insert new rows in my database (which shows the data in GridView1). The first textbox (BIDTextBox) i have on this template, contains text which identify a person. I would like to have a routine which checks if the same value that is entered in the BIDTextBox allready exists in the database. This routine should be fired upon leaving the control BIDTextBox.
I have tried with some stored procedure in my database, but that dosn't seem to do the trick. The most logical to me seems to do a loop thru my table "Ansatte" in my database using sql, selecting any occurence from the field "BID" in my table "Ansatte" that is simillar to the text entered in the BIDTextBox.
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Aug 17, 2012
this is my code in page
<asp:DataList ID="DDLC" runat="server">
<ItemTemplate>
<div id="Dmainart">
<div id="Dart1_12">
<div id="Dart1_I1"><asp:Image ID="asp:Image" runat="server" CssClass="TPH" ImageUrl='<%#Eval("image","image/house/article/image/{0}")%>' Width="90px" Height="64px"/>
[code]...
i want if there wasnot any image in image column in database this div <div id="Dart1_I1"> display="none".
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Mar 28, 2013
This code retrieve image from SQL database i want to add code if image is not exist retrieve another image in null valueÂ
protected void Page_Load(object sender, EventArgs e) {
if (!IsPostBack) {
string connectionString = WebConfigurationManager.ConnectionStrings["conString"].ConnectionString;
SqlConnection con = new SqlConnection(connectionString);
[Code] ....
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Sep 22, 2010
I have a page that inserts a record to an sql database and I would like to do the following:
(i) Check if a record already exist before trying do an insert
(ii) If a record exist, the page should be able to inform/display a message in a textbox informing the user that the record already exist.
I have seen a number of post on the internet that suggest that one possible solution is to write a sproc and use the T-sql IF EXIST function. However, I have NOT seen a complete code showing (a) how this can be done (b) how to call the sproc from an asp page (c) and MORE IMPORTANTLY how to display a message informing a user that a record already exist i.e. when the record already exist in the database.
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Jan 12, 2010
I have .Net web application which connects to Oracle 10g database. I want to check for space availibility before creating Indexes. Also if space is not sufficient then I would like to send an Email message to admin. How to do that from .Net web application?
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Jul 1, 2010
For this applications, I will have a table that has a list of users who are "moderators" and they are able to see a part of the website that regular users cannot. I will NOT have a login or anything like that - I have a table that lists all the users who are moderators and if the user who is logged in is a moderator they simply see more of the website.
Right now I am able to get the username of the logged user (these are users who log into a Windows machine, and I simply get their login using a method from System.Security).
The thing I have no idea how to do is actually compare the username to the username in the database that I have. can anyone point me to a tutorial or something that searches through a database to compare the given value and see if there is an identical one in a specific database? I don't want the user to see the database, this is all done "behind the scenes".
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Mar 30, 2011
I want to validate Username and Password in a database. My database name is UsersLogin. The database table name is UsrLogin. The users are Mary with password: acd222 andJohn with password: dbd445 (field names : Usersand UserPassword)How can these 2 users login using their individual account details? And how can i lock them out after 3 wrong attempts
[Code]....
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Mar 10, 2010
I got a username and password field which made by myself and a User database which is all manually made
So now I wish to know how to authenticate user using the username and password data enter by the user and match with the database data to verify user is a member and login?
For what i know, the code should be something like this
SELECT UserName, Password FROM dbo.User WHERE UserName - @UserName
@UserName = ?
How do i assign the value from my username text field to @UserName?
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Feb 16, 2010
so I will admit this is a pretty stupid question. To my defense, I have never done it before. So take pity. I followed Joe Stagner's video on using the built-in authentication. Now, I would like to query a database using VB.net codebehind to verify if the user exists. I am clueless. Yes, I have a connection string already.
[Code]....
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Dec 1, 2010
I am working on a website where when the user logs in, I select their database based on their username. Currently I have a list of all databases in the web.config and I select the Database ID from the username and then read the database string from web.config. What is the most optimal way to implement this scenario?
currently I:
- store the Database ID in the session object
- the Session object expires after like 5 minutes so i have to read the Database ID from the online database based on the username and regenerate the Session["DatabaseID"] again.
- there are some security issues with the Session ID, so I started clearing the Session in !(Page.IsPostBack) and I generate the Database string again.
Where shall I store the DatabaseID and the database connection string so I can easily reuse it once the user has logged in?
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Jan 16, 2012
I want to develop the feature to check whether username  is available in database using ASP.Net and SQL server ....
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