SqlClient to the top of your file. If you're using Visual Studio, you can right-click on SqlConnection and let Visual Studio find the correct namespace and add a using for you. This works for any class where you already have a reference to the assembly that contains it. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Collectives on Stack Overflow. Learn more. SqlConnection namespace not found Ask Question. Asked 5 years, 8 months ago. Active 5 years, 8 months ago. Viewed 4k times. SqlConnection con; it works. Improve this question. You may want to read through some of the ASP. SqlCommand dbCommand. ExecuteNonQuery Finally dbConnection. Or sorry I use C sorry Not my code say Format of the initialization string does not conform to specification starting at index 0.
Data" StackTrace: at System. Callback Object sender, EventArgs e at System. OnLoad EventArgs e at System. LoadRecursive at System. Okay soe i need to make a DataSoruce? Thursday, March 16, PM. SqlTypes; using System. SqlClient; using Microsoft. Server; Have Fun Coding! A database with the same name exists, or specified file cannot be opened, or it is located on UNC share. Open ; hmmm im realy lost right now Open ;.
ComponentModel; using System. Drawing; using System. Linq; using System. Text; using System. Forms; using System. ExecuteNonQuery ; MessageBox. It will save the record into database. ExecuteScalar : The ExecuteScalar returns a single value from the database. Generally, it is used with an aggregate function a function which returns a single value. Suppose there is a need to check how many records are in the database table.
Then we use this function. Add another button to your application and set its text property to "Count" and write the following code on button click. ToString ; MessageBox. The default implementation invokes the synchronous Open call and returns a completed task.
Exceptions thrown by Open will be communicated via the returned Task Exception property. Do not invoke other methods and properties of the DbConnection object until the returned Task is complete. Returns a String containing the name of the Component , if any.
This method should not be overridden. Occurs when the component is disposed by a call to the Dispose method. Begins a database transaction with the specified IsolationLevel value. Creates and returns a DbCommand object that is associated with the current connection.
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Privacy policy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. SqlClient Assembly: System. Represents a connection to a SQL Server database. This class cannot be inherited. Note Login and logout events will not be raised on the server when a connection is fetched from or returned to the connection pool, because the connection is not actually closed when it is returned to the connection pool.
Note To deploy high-performance applications, you must use connection pooling. Caution You can force TCP instead of shared memory.
Is this page helpful? Yes No. Any additional feedback? Skip Submit. SqlConnection String. SqlConnection String, SqlCredential. Inherited from DbConnection. Gets a value indicating whether the component can raise an event. Inherited from Component. Gets the name of the current database or the database to be used after a connection is opened.
Gets the size in bytes of network packets used to communicate with an instance of SQL Server. BeginDbTransaction IsolationLevel. When overridden in a derived class, starts a database transaction. Asynchronously starts a database transaction. BeginTransaction IsolationLevel. BeginTransaction IsolationLevel, String. Starts a database transaction with the specified isolation level and transaction name. BeginTransaction String.
BeginTransactionAsync CancellationToken. Asynchronously begins a database transaction.
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