How can I check for a NULL value in an open MySqlDataReader?开发者_运维百科 The following doesn\'t work; it\'s always hitting the else:
I am using a dataset to pull data from a DB. One of the fields in a row is NULL. I know this. However, the following vb.net code throws a Str开发者_开发知识库ongTypingException (in the autogenerated g
I have the following C# code: sqlCommand.Parameters.AddWithValue(\"@Parameter\", table.Value ?? DBNull.Value);
I have seen many, many versions of this开发者_Go百科 on SO, but none of them seem to quite work for my needs.
Please can any one advise me if it is possible to decalre a custom structure that can be assigned Nothing and / or Db开发者_开发问答Null.Values, and also can be instanciated as Nothing?
I have a MaskedTextBox control with the mask \"00/00/0000\", the PromptChar \"_\" and the ValidatingType of DateTime, bound to a DateTime column in a database that can also accept null values.
I\'m making my first forays into Accessing Oracle from C#. I\'ve discovered that that Oracle doesn\'t like VarChar parameters to have value of null (C#). I would have hoped that there would be some im
I have a Windows forms DataGridView with a combobox column.The combo box column is bound to a data source that is populated from开发者_运维百科 a Linq to Entities query.I would like users to be able t
I use OleDB to read an Excel file. One of the columns has a \"Common\"开发者_运维百科 format and contains both strings with letters and values consisting of numbers only. String values are retrieved w
I am writing a simple ASP.NET MVC web app. At this point, I am just trying to display a strongly typed DataSet on the automatically generated view. However, some of the values in the DataSe开发者_开发
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