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.
View 6 RepliesHow to use ajax for checking username from database on text change?
Also give the method for on button click
I need to check for duplicate records before inserting them into the SQL database.Thus I have the following codes:
For count = 0 To GridView1.Rows.Count
If (GridView1.Rows(count).DataItem("Student Name").Equals(dtDataTable.Rows(count).Item("Student ID"))) Then
lblMsg.Text = "Records Existed"
End If
but there are error message. "Object variable or With block variable not set."
i have code to update multiple rows in a gridview. What I want is that if the row value is = 1 in the database then the row is checked otherwise it's not. I've put some pseudo code in below to illustrate what I want to achieve.
[code].....
I need to check the username availability like twitter.com (https://twitter.com/signup) in asp.net/c# 3.5 with AJAX concept. How to do this?
View 2 RepliesI 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.
View 2 RepliesI am having a big problem with the OnTextChanged event of a textbox....
I have tried several different scenerios and just don't seem to be getting it to work right...
I either get a full page postback which is not what I want or get a very peculiar extra textbox added to my page after OnTextChanged is executed...
currently the update panel is working as expected but it inserts an extra textbox into my form "magically"... so strange...the textbox that is added keeps a running history of what is submitted...you can take a look here at the behavior.. it is the email form in the middle of the page
Sample
Here is what I am working with...
[Code]....
and then in the code behind I insert a image to let the user know what is going on..
[Code]....
not sure why an extra textbox is added but everything else seems ok.....
How to check username is exist in database or not without postback the page...
View 1 RepliesIs there a cleaner way to check for a null value comming from the database?
Right now i am doing this
[Code]....
There has to be a better what than doing this on every row which could possibly be null
in my gridview i have a list of names that are bound.
in my aspx i have a list of names that i can select from.
i want to see if each selected name is already in the grid.
something like
if (li.Value == row.FindControl("Name").ToString())
I am using seperate buttons to control whether edit and delete row linkbuttons are enabled or not on the GV. When I click a buton to enable the edit linkbuttons on the GV and then click a linkbutton for a row that puts it in edit mode. Then if the Delete button is clicked I have code that disables the edit linkbutton and enables the Delete linkbuttons. But, if there is a row in edit mode and the delete button is clicked, the edit linkbuttons disappear and the delete buttons appear (as expected) but the row that was in edit mode does not have a delete linkbutton in it and the row is still in edit mode with no update/cancel buttons. When the delete button is clicked, if there is a row in edit mode, I need to cancel any edit modes in any row.
View 3 RepliesI'm using C# and SQL Server. I have one gridview which contain 3 columns "ID, COMPLETED (either yes or no), BY (adminID that completed)" and adminID can be null.
If user selected "yes" in COMPLETED column then how can I make sure that adminID in BY column is NOT empty or adminID entered is EXIST in database.
I would like my website to fetch the data for username and password from a database in SQL server and authenticate that. I have used a login control in the website.
Presently I can assign username and passwords using the 'login control' from the website administration tool.
I'm populating a DataList using the IDataReader object and it works fine it the reader contains data. If the data is not present it displays nothing. I want to capture that situation and insert a verbiage such as "No data" or something like that. I've tried to test the datareader for various conditions such as Null, String.Empty, or plain " " but nothing worked. Is there a way to make this happen? Below is my code sample for your review.EJM.Note: It has to be done programatically as I'm building this for a web part.
[Code]....
I've been pickling my brain trying to do this for a couple of days but to no avail. I have the following in "FormView1" which I'm just using in insert mode:
<td class="style4">
<asp:TextBox ID="urlTextBox" runat="server" Text='<%# Bind("url") %>' CausesValidation="True" Width="200px" />
</td>
I'd like the contents (i.e. whatever the user wants to insert) to be passed to a method where it will be checked against any existing values in the database.
I have some controls on the asp.net page that can be required on certain senario and can be not required on others.
So we enable/disable them dinamaically depending on the current transactions.
Now I am thinking of a way where I can check the required field by Javascript on the click event of save button. Remember control not be required at all time.
checking for null on aspx page
[Code]....
I need to know how to check last updated rows in Gridview.
View 2 RepliesI am attempting to convert an online game i have written in ASP into ASP.NET,, but I am failing at a very early and probably a very amateurish stage.
I am using a Sample ASPX project. There is an ASPNETDB database included, when i register my username is added to the DB along with a userID and various other fields. This is stored in a table called aspnet_Users.
The Login Control is stored in a Site.Master file
<div class="loginDisplay">
<asp:LoginView ID="HeadLoginView" runat="server" EnableViewState="false"
onviewchanged="HeadLoginView_ViewChanged">
<AnonymousTemplate>
[ <a href="~/Account/Login.aspx" ID="HeadLoginStatus" runat="server">Log In</a> ]
</AnonymousTemplate>
<LoggedInTemplate>
Welcome <span class="bold"><asp:LoginName ID="HeadLoginName" runat="server" /></span>!
[ <asp:LoginStatus ID="HeadLoginStatus" runat="server" LogoutAction="Redirect" LogoutText="Log Out" LogoutPageUrl="~/"/> ]
</LoggedInTemplate>
</asp:LoginView>
I have created a new table called tblClubs, which stores information such as ClubName, StadiumCapacity etc
I added a field called 'Owner' and this is directly related to the UserName field in the aspnet_Users table
What I am trying to solve is to show user specific information from the database, based on their LoginID.
i.e
My username is Laclerque and my club is called Racing Mongoose, the stadium capacity is 9500.. the information for each User needs to be different and just show the information that is relevant to them.
obviously in the longer term, there is going to be 100's of these associations required for the full game, but not until i can get my head around the basics of how to set this information. I tend to work better when i can see a working sample, and then adapt things to suit my needs.
I have a textbox, when ab OrderNo is entered in the textbox 3 GridViews are generated.
GridView1 has general data about the order
GridView2 has data about the items on the order
GridView3 has data about reserved/back order items on the order. GridView3 only has data if the order has items reserved or on back order.
Is it a way to check if the GridView3 has data or not?
I have tried
If GridView3 isnot Nothing then
'gets some data from GridView3
End If
But does not work. The code still goes inside the code block and returns an error when finding no data...
I have the listview as bellow:
[Code]....
I am using a DetailsView control to allow for updating a user record. Is there a way to check if the values are actually updated/changed when the update link is clicked. I know there are users, who would click the update button rather than the "Canel" even if there are no changes to the record. So, how do I check if any value has been updated when the update link is clicked. The DetailsView uses a SqlDataSource to populate the DetailsView.
View 4 RepliesI am using a form to add and edit record of database.
In Add case my email box has no value. I have used customservervalidation to check the given email address with previous database records.
In Edit case my email box is populated with data from database.
When i click save button in both cases my customservervalidation method invokes and checks the given value. it works fine for new/add case but in edit case it checks with itself also and says duplicate email... pointing own record...
I having problem on the checking duplication entry on grid view. The situation is like this:
When i click Submit Button, The function will make a checking into mysql. If the data already exist then the submition of data will not being process. The error that i got here is, Both already exist and not exist data not being process. this is my checking coding
[Code]....
I have a formview that I open to the edit template, some textboxes are not available and some are populated by dropdown lists, and the update function works fine.
As soon as I add some logic to the code behind page for the update control, the UPDATE link on the formview stops updating my DB.