SQL Server :: Check If Value Exists Before Inserting?
Oct 27, 2010
I want to be able to check if a value exists before inserting a new record in the table. I am taking a nvchar value from a textbox and want to compare it to existing values in the table. My codebehind is:
[Code]....
It is also important to filter down by CompanyID which is held in a Profile table. So the value can be equal in records where the CompanyID does not equal the loggedin Profile.CompanyID. So a user with a CompanyID of 2 can have a value in the table for SubType as "laptop" but a user with CompanyID of 3 can still enter "laptop" if there is no match for "laptop" and companyId = 3.
I am very new to this and have watched a lot of the videos. While trying out VWD2010 and SQL2008 Express, I come across many things, I just don't know how to do. Here is the latest:
I have a Table UserId - Int - AutoIncrement FirstName - Var(10) LastName - Var(10)
I also have an ASP web page that allow the user to enter a first name and last name. It also has a button to submit. What I would like to do is have a Select statement check to see if the name already exists, then send a comment back to the user via a label. If it doesn't exist, then I would like to Insert the info and then again inform the user via label.
On the code behind, I get lost. (Obviously this doesn't work, but I don't know how to go about getting a results back. Protected Sub bSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles bSubmit.Click
SqlDataSource1.Select(DataSourceSelectArguments.Empty) (get a return) (check return value, if <>0 then lblResults.Text = "exists!" else SqlDataSource1.Insert() lblResults.Text="added!" end if) End Sub
I have aregistration form where the user enters, among other things, a username. The form must make sure that the username is not already taken before the user submits the info.
Here's my code so far in the .aspx.cs:
[Code]....
I'm not sure how to call this function from the .aspx part... .
I tried to illustrate the problem by providing the following instructions, unfortunately the data was deleted and the example failed. It is now working. I have been working through one of Scott Mitchells ASP.NET Application Tutorials Title "Using TemplateFields in the GridView Control"
The URL is ...
The example demonstrates a temporary field being used in different ways, one of which involves dates in a Calender. If the HireDate in the example is deleted or not available the program fails. Providing the date is a valid date it works fine....
i am building a project using C# Asp.Net in which i am registering users with a user id, now my question is that how to check that the user id is already exists in the user table or not when user trying to register, i am using sql server 2000?
i have two datatable, while adding rows in second datatable, i want to first check whether the id in the second datatable matches as in the first datatable, if not only then it should be added in the second datatable, else it should display a message...
i dont have any Primary Key defined on any column, so the rows could be repeatative.
I am a beginner coder, i am building a project using C# Asp.Net in which i am registering users with a user id, now my question is that how to check that the user id is already exists in the user table or not when user trying to register, i am using sql server 2000?
How to check if a file exists on different domain?
If File.Exists("http://i1.asp.net/common/header/logo.png?cdn_id=01112010_2") Then Return String.Format("<img src={0} alt='' />", "http://i1.asp.net/common/header/logo.png?cdn_id=01112010_2" Else Return String.Empty 'always ends here [:(] End If
Is there a free/open source tool to verify wether a domain exists in c#?I ve a textbox where my user can enter his domain name and list of radio buttons like .com,.net,.in etc... Is there any webservice that does it? EDIT : I need to check only the domain name availability..
I am taking backup for mdb file from source location to destination location.While using file.copy() function,how to check whether the folder is already exists or not.If exists means how to replace new one for existing one.Send C# code for replace new one for existing one.
I have two websites. One site contains nothing but image files. This is a sub-domain of the main website. The main website allows the user to search a database of information and displays that information. I create a grid with a link to the file. In my row_databound function, I want to check to see if that file exists on my other website. If it doesn't I remove the link, otherwise I leaves a link to that file. how to verify that the LINK actually goes to a file that exists?
2) Sample the size of that ftp file (3) times to ensure the file is ready for downloading.
We have some classes doing this already but they are using WebRequestMethods.Ftp.ListDirectoryDetails and then searching there in if file exists. I am hoping there are some clean ways to do this.
