DbConnectionStringBuilder.Add(String, Object) DbConnectionStringBuilder.Add(String, Object) DbConnectionStringBuilder.Add(String, Object) DbConnectionStringBuilder.Add(String, Object) Method

public:
 void Add(System::String ^ keyword, System::Object ^ value);

public void Add (string keyword, object value);

member this.Add : string * obj -> unit

Public Sub Add (keyword As String, value As Object)

Parameters

Exceptions

Examples

The following example creates a new DbConnectionStringBuilder and adds items. The code also demonstrates overwriting an existing item using the Add method, and includes a commented block that would throw an ArgumentNullException.

static void Main()
{
    try
    {
        DbConnectionStringBuilder builder =
            new DbConnectionStringBuilder();
        builder.Add("Data Source", "ServerName");
        builder.Add("Initial Catalog", "TheDatabase");
        builder.Add("User ID", "UserName");
        builder.Add("Password", "*******");
        builder.Add("Command Logging", false);

        // Overwrite the existing "User ID" value.
        builder.Add("User ID", "NewUserName");

        // The following code would trigger 
        // an ArgumentNullException:
        // builder.Add(null, "Some Value");

        Console.WriteLine(builder.ConnectionString);
    }
    catch (ArgumentNullException)
    {
        Console.WriteLine("Null key values are not allowed.");
    }

    Console.WriteLine("Press Enter to continue.");
    Console.ReadLine();
}

Sub Main()
    Try
        Dim builder As New DbConnectionStringBuilder
        builder.Add("Data Source", "ServerName")
        builder.Add("Initial Catalog", "TheDatabase")
        builder.Add("User ID", "UserName")
        builder.Add("Password", "*******")
        builder.Add("Command Logging", False)

        ' Overwrite the existing "User ID" value.
        builder.Add("User ID", "NewUserName")

        ' The following code would trigger 
        ' an ArgumentNullException.
        ' builder.Add(Nothing, "Some Value")

        Console.WriteLine(builder.ConnectionString)

    Catch ex As ArgumentNullException
        Console.WriteLine("Null key values are not allowed.")
    End Try

    Console.WriteLine("Press Enter to continue.")
    Console.ReadLine()
End Sub

Remarks

The Item[String] property can also be used to add new elements by setting the value of a key that does not exist in the dictionary. For example: myCollection["myNonexistentKey"] = myValue.

Calling the Add method by passing a null (Nothing in Visual Basic) key throws an ArgumentNullException. However, calling the Add method by passing a null value removes the key/value pair.

Applies to

See also

• Working with Connection Strings
• ADO.NET Overview