C#

MyTextBox controlAsTextBox = ctrl as MyTextBox;
if(controlAsTextBox != null)
{
    ....
}

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Judah Himango

Jon Hulatt wrote:

i can't copy protected members from A to the new DerivedFromA instance.

Guffa wrote:

Yes, you can. You can access any protected members from the derived class. That is exactly what the protected keyword does, it allows access only from members of the class and from members of any derived classes.

class A
{
    protected string astring = "hello world";
}

class B : A
{
    public static B FromA(A ainstance)
    {
        string testing = ainstance.astring; // <-- Can't do this
    }
}

class A {
	protected string astring = "hello world";
	public A(A ainstance) {
		this.astring = ainstance.astring;
	}
}

class B : A {
	public B(A ainstance) : base(ainstance) {
	}
}

Guffa wrote:

No, you can't cast an object to a class the inherits from the class of the object. You can only cast an object to any of it's base classes.

malharone wrote:

Are you using the Menustrip control that comes with .Net or a 3rd party menu control? I used MagicLibrary MenuCommand in one of my MDI apps which caused similar issue. I ended up using the standard menu bar.

SqlDataSource1.ConnectionString = "your connection string";<br />
SqlDataSource1.SelectCommand = "select * from table";<br />
DataGridView1.DataSourceID = "SqlDataSource1";