Prepare (overridden)

Namespace: System.Data.SqlClient
Assembly: System.Data (in system.data.dll)


This method creates a prepared version of the command on an instance of SQL Server.

If CommandType is set to StoredProcedure, the call to Prepare should succeed, although it may cause a no-op.

Before you call Prepare, specify the data type of each parameter in the statement to be prepared. For each parameter that has a variable length data type, you must set the Size property to the maximum size needed. Prepare returns an error if these conditions are not met.

If you call an Execute method after calling Prepare, any parameter value that is larger than the value specified by the Size property is automatically truncated to the original specified size of the parameter, and no truncation errors are returned.

Output parameters (whether prepared or not) must have a user-specified data type. If you specify a variable length data type, you must also specify the maximum Size.

Using the Prepare method can increase the performance of your application!

Example: How to use the Prepare method

InvalidOperationException
This exception will occur when the Connection has not been set or the Connection is not open

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