dotnet core barcode generator

dotnet core barcode generator

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basic support for many widgets, including text boxes, drop-down lists, list boxes, check boxes, and radio buttons as well as traditional buttons and submit buttons. This basic HTML support for forms was the building block for Active Server Pages (ASP) developers, who were able to add additional processing and validation to user input in HTML forms. Validation especially is different in HTML forms than in traditional Microsoft Windows application forms. For instance, 5/35/2001 isn t correct input when a date is required. Unlike a Microsoft Visual Basic 6.0 application or a Windows Forms application, your ASP.NET application can t conveniently create forms with masked inputs that will make invalid entries impossible. There is no ASP.NET equivalent for the DateTimePicker control in the Windows Common Controls, which automatically ensures that each part of the date month, day, and year is correct and consistent. Note It s certainly possible to use JavaScript to micromanage the input on a Web Form, disallowing invalid entries such as 5/35/2001 as a date as they re entered, but generally that isn t the way Web applications work. ASP developers commonly code defensively, writing basic validation code using JavaScript that will be executed on the Web client, as well as writing additional validation code that will be executed on the server, in case the client-side validation isn t effective because the browser doesn t have the required features or the required settings.

Return to the Authors.cs class file. Add using (Imports in Visual Basic) statements to the class file for System.Data, System.Data.SqlClient, and System.Configuration. Add a private variable at the class level to store the connection string to the Pubs database. Name this variable _cnnString, as shown in the following code.

Sample of Visual Basic Code Private _cnnString As String = _ ConfigurationManager.ConnectionStrings("PubsConnectionString").ToString Sample of C# Code private string _cnnString = ConfigurationManager.ConnectionStrings["PubsConnectionString"].ToString();

1. Install Windows Server 2003, Enterprise Edition, and configure the computer as a standalone server named DC1. 2. Configure the connection to the intranet segment with the Internet Protocol (IP) address of 172.16.0.1 and the subnet mask of 255.255.255.0.

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Add a method to the class to return all titles for a specified author based on the authorId. These titles can be returned as a DataTable instance. Name this method GetAuthorTitles. Tag the GetAuthorTitles method with the WebMethodAttribute class. Set the CacheDuration to 300 seconds. Your method should look as follows.

Sample of Visual Basic Code <WebMethod(CacheDuration:=300)> _ Public Function GetAuthorTitles(ByVal authorId As String) As DataTable Dim sql As StringBuilder = New StringBuilder() sql.Append("SELECT titles.title, titles.type, titles.price, ") sql.Append("titles.pubdate FROM titleauthor INNER JOIN titles ON ") sql.Append("titleauthor.title_id = titles.title_id ") If authorId <> "0" Then sql.Append("WHERE (titleauthor.au_id = @AuthorId) ") Dim cnn As New SqlConnection(_cnnString) Dim cmd As New SqlCommand(sql.ToString(), cnn) cmd.Parameters.Add("AuthorId", SqlDbType.VarChar, 11).Value = authorId Dim adp As New SqlDataAdapter(cmd) Dim ds As New DataSet() adp.Fill(ds) Return ds.Tables(0) End Function Sample of C# Code [WebMethod(CacheDuration = 300)] public DataTable GetAuthorTitles(string authorId) { StringBuilder sql = new StringBuilder(); sql.Append("SELECT titles.title, titles.type, titles.price, "); sql.Append("titles.pubdate FROM titleauthor INNER JOIN titles ON "); sql.Append("titleauthor.title_id = titles.title_id "); if (authorId != "0") sql.Append("WHERE (titleauthor.au_id = @AuthorId) "); SqlConnection cnn = new SqlConnection(_cnnString); SqlCommand cmd = new SqlCommand(sql.ToString(), cnn); cmd.Parameters.Add("AuthorId", SqlDbType.VarChar, 11).Value = authorId; SqlDataAdapter adp = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); adp.Fill(ds); return ds.Tables[0]; }

ASP provided little direct support for form validation, and thus you were free to do pretty much as you pleased. Even within the same development group, you can generally find one or more models for accepting and validating input. I m sorry to report that even within a single developer s code, you might find more than one structure for handling form validation (at least if I m the developer in question ). Every HTML form has an action attribute in the <FORM> tag that points to a URL. The URL can be absolute, beginning with http://, or relative, perhaps beginning with a slash (/) to refer to the root of the current site, or just a file name that must exist in the same folder as the page the form is in. When the form is submitted, the contents of the form are sent to the URL referred to by the action attribute of the <FORM> tag. The two common ASP structures are shown in Figures 5-1 and 5-2.

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