hi,guys When coding,I find some code:"if ((value != null) && (value != DBNull.Value))". Any difference?
An OpenFileDialog control is used to browse and select a file on a computer. This article demonstrates how to use a windows Forms open file dialog in C#.
This C# tutorial uses the MessageBox.Show method in Windows Forms.
Connection strings for SQL Server. Connect using SqlConnection, Context Connection, SQLNCLI11 OLEDB, SQLNCLI10 OLEDB, SQLNCLI OLEDB, sqloledb, SQLXMLOLEDB.4.0.
ExecuteReader expects to run a query command or a stored procedure that selects records. It expects to have one or more resultsets to return. cmd.Connection.Open(); SqlDataReader dr = cmd.ExecuteReader(); // process the resultset(s) here cmd.Connection.Close(); You access the selected records using the SqlDataReader object and use the method Read to loop through them. You move…
SQL Data Types for MySQL, SQL Server, and MS Access
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MZ-Tools 8.0 provides many features to find code faster, design faster, code faster, generate documentation, ensure the quality and enhance your Visual Studio experience.