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OleDbCommand.Parameters Property

Gets the OleDbParameterCollection.

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

public OleDbParameterCollection Parameters { get; 
/** @property */
public OleDbParameterCollection get_Parameters ()

public function get Parameters () : OleDbParameterCollection

Property Value

The parameters of the SQL statement or stored procedure. The default is an empty collection.

The OLE DB .NET Provider does not support named parameters for passing parameters to an SQL statement or a stored procedure called by an OleDbCommand when CommandType is set to Text. In this case, the question mark (?) placeholder must be used. For example:

SELECT * FROM Customers WHERE CustomerID = ?

Therefore, the order in which OleDbParameter objects are added to the OleDbParameterCollection must directly correspond to the position of the question mark placeholder for the parameter in the command text.

NoteNote

If the parameters in the collection do not match the requirements of the query to be executed, an error may result.

For more information, see Using Stored Procedures with a Command.

The following example creates an OleDbCommand and displays its parameters. To accomplish this, the method is passed an OleDbConnection, a query string that is an SQL SELECT statement, and an array of OleDbParameter objects.

public void CreateMyOleDbCommand(OleDbConnection connection,
    string queryString, OleDbParameter[] parameters) 
{
    OleDbCommand command = new OleDbCommand(queryString, connection);
    command.CommandText = 
        "SELECT CustomerID, CompanyName FROM Customers WHERE Country = ? AND City = ?";
    command.Parameters.Add(parameters);

    for (int j=0; j<parameters.Length; j++)
    {
        command.Parameters.Add(parameters[j]) ;
    

    string message = "";
    for (int i = 0; i < command.Parameters.Count; i++) 
    {
        message += command.Parameters[i].ToString() + "\n";
    
    Console.WriteLine(message);


Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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