Rendering custom error pages can be helpful when, for example, the custom error page provides some information on how to resolve the error. Perhaps if a client attempts to access a file which does not exist on the web site, meaning they receive a 404 HTTP status code, you can render a page which has […]
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Common sense, maybe…, worthy of a blog, absolutely. I was creating an ordering system using NHibernate and the table which stored the orders was called ORDER. This resulted in an error, which I believe would come from any data retrieval source, I just happen to be using NHibernate with SQL Server and Oracle. The error […]
Read More →I tend to overcomplicate things, I think that I do it subconsciously in an attempt to make sure I give due diligence in the search for the best solution. I had a parent child relationship mapped out using NHibernate. Something like the below where there is a one-to-many bag in the parent class and a […]
Read More →While trying to insert parent child composite key linked into a database I received this error: Ungültiger Index N für SqlParameterCollection mit Count=8 Invalid Index N For This SqlParameterCollection with count=8 When I added the: insert=”false” attribute to the 8th property in my mapping file, the issue was resolved. Start with the ID at 0 […]
Read More →One of the errors I received when I was trying to get the parent child insert to work with NHibernate was: Ein expliziter Wert für die Identitätsspalte kann nicht in der ‘CHILD’-Tabelle eingefügt werden, wenn IDENTITY_INSERT auf OFF festgelegt ist Cannot insert explicit value for identity column in table ‘IdentityTable’ when IDENTITY_INSERT is set to […]
Read More →In a situation where I have a DataGrid which is being bound to a List of a specific class and the DataGrid has AutoGenerateColumns set to true, I found myself needing a way to hide some of the columns which I did not want to present to a user. Below is an example of binding […]
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There are a number of name differences between a windows form and a WPF program. For example, in a windows form program the event which is triggered when a user double-clicks on a data grid is called Doubleclick. The event in a WPF program is called MouseDoubleClick. Therefore the way to implement, program or add […]
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The way a problem is approached can have some serious consequences. Take for example the task I had to add some data to a DataGrid in WPF and allow a user to select the rows. When the rows were selected I would capture the details and put them into a form where they could be […]
Read More →I needed to save an XML formatted file as a string which required double quotes around the attributes. The below code shows how to add double quotes to a string. string data = “<customer name=\”Ben Perkins\” class=\”Customer\”> <property name=\”Id\” /><property name=\”Address\” /> <property name=\”Occupation\” /> <property name=\”Remark\” /></ customer >”; Notice […]
Read More →It took me some time to find out that you cannot have periods “.” in the column name of dynamically created DataTables. I would run the query, created the columns and add the rows to the table, but nothing would show in the DataGrid when I bound it. I use the HQL interface from NHibernate […]
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