C# - Check User Id Already Exists?

May 22, 2010

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?

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Check User Id Already Exists?

May 22, 2010

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?

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[Code]....

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The URL is ...

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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
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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.

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<asp:ControlParameter ControlID="tbFirstName" Name="FirstName"
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<asp:ControlParameter ControlID="tbLastName" Name="LastName"
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<SelectParameters>
<asp:ControlParameter ControlID="tbFirstName" Name="FirstName"
PropertyName="Text" Type="String" />
<asp:ControlParameter ControlID="tbLastName" Name="LastName"
PropertyName="Text" Type="String" />
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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)
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else
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lblResults.Text="added!"
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How do i check that a parameter in a url exists or is not mispelled.

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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]....

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{

}

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How to check if a file exists on different domain?

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[Code]....

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