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how to generate qr code in asp.net core

Right-click on the App_Code folder and choose the Add New Item option. Add a new class named SqlHelper. This class will act as a data access layer and will take the data in and out of the database. The complete code of the SqlHelper class is shown in Listing B-1. Listing B-1. SqlHelper Class using using using using System; System.Configuration; System.Data; System.Data.SqlClient;

public Enumeration getParameterNames()

public class SqlHelper { private static string strConn;

You may also work with the entire request parameters as a Map object, with the getParameterMap() method. This method will return a Map of the request parameter names and values. The values in the Map are String arrays. If there are no parameters on the request, the Map will be empty.

public Map getParameterMap()

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how to generate qr code in asp net core

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Once you understand one layout control, you pretty much understand them all. The important thing to remember is that layout controls can be stacked (i.e., a layout control can contain another layout control), and with this in mind you can get great control over your window s behavior. Here s an example of an application that uses multiple DockPanel and StackPanel controls to create a typical MDI-style application with a toolbar, a status bar, docks on the left and right, and a client area:

static SqlHelper() { strConn = ConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString; } public static int ExecuteNonQuery(string sql, SqlParameter[] p) { SqlConnection cnn = new SqlConnection(strConn); SqlCommand cmd = new SqlCommand(sql, cnn); for (int i = 0; i < p.Length; i++) { cmd.Parameters.Add(p[i]); } cnn.Open(); int retval = cmd.ExecuteNonQuery(); cnn.Close(); return retval; } public static object ExecuteScalar(string sql, SqlParameter[] p) { SqlConnection cnn = new SqlConnection(strConn); SqlCommand cmd = new SqlCommand(sql, cnn); for (int i = 0; i < p.Length; i++) { cmd.Parameters.Add(p[i]); } cnn.Open(); object obj = cmd.ExecuteScalar(); cnn.Close(); return obj; } public static DataSet GetDataSet(string sql,SqlParameter[] p) { SqlConnection cnn = new SqlConnection(strConn); SqlCommand cmd = new SqlCommand(sql, cnn); if (p != null) { for (int i = 0; i < p.Length; i++) { cmd.Parameters.Add(p[i]); }

We will discuss setting render parameters on the action response later in the chapter. These render parameters become the parameters for the render request of a portlet after the action request is called.