I am trying to iterate through a hashtable using an enumerator. I want to change some values as I go. Here is a simplified version of my code…. ptr = hashTab.GetEnumerator While ptr.MoveNext hashTab.Item(ptr.Key) = “something different” End While I get the following exception when I change a value – Collection was modified; enumeration operation may not execute. What is the correct way to perform this type of operation? John.

You are right! When I tried your solution the first time I changed the second parameter but not the third. When I made both changes it worked. So it looks like a bug in the designer. When I set the DataBindings in the property window of the TextBox it generates code the incorrect way. So now I am not binding that way but via my own code. Thanks for your help. John.

The full error is: An unhandled exception of type 'System.ArgumentException' occurred in system.windows.forms.dll Additional information: Cannot create a child list for field People. I single stepped through the program and the error happens after this line of code runs (every line of code in the Form1 constructor steps through okay but it fails when the last line has been executed and it returns to this line. If I break into it is breaks on the line after this one - int i = 0). Application.Run(new Form1()); I read the documentation. Can you get it to work using the designer interface? Or even via code? John.

Thanks for the reply. I tried that and I get the error; "Cannot create a child list for field People." This code is generated automatically when you set up the data binding for the textbox in the designer so should be okay, right??? John.

I created a windows form. I added a SQLConnection, a SQLDataAdaptor, a DataSet all via the designer. I then added a TextBox and a ListBox and databound them both to a column in the DataSet. I then added a button that will show the next record with the following code; this.BindingContext[this.dsPeople1.People].Position ++; When I run this the ListBox’s selected line moves to the next record but the TextBox stays on the first record. Am I missing something? This is the code that has been generated for the TextBox and the ListBox. this.textBox1.DataBindings.Add(new System.Windows.Forms.Binding("Text", this.dsPeople1, "People.First_Name")); this.listBox1.DataSource = this.dsPeople1.People; this.listBox1.DisplayMember = "First_Name"; John

First this is what I am trying to achieve. I want a single checkbox and a textbox. If the checkbox is checked (selected) I want the textbox to instantly become invisible or read-only. If the checkbox is un-checked I want the textbox to be visible and writable. The environment is ASP.NET mobile controls i.e. a browser on a mobile phone, PDA, etc. Ideally I don’t want to postback when the checkbox is selected. I assume I need a SelectionList to create a checkbox but where do I go from there? Thanks. John.

First this is what I am trying to achieve: I want a single checkbox and a textbox. If the checkbox is checked (selected) I want the textbox to instantly become invisible or read-only. If the checkbox is un-checked I want the textbox to be visible and writable. The environment is ASP.NET mobile controls i.e. a browser on a mobile phone, PDA, etc. Ideally I don’t want to postback when the checkbox is selected. I assume I need a SelectionList to create a checkbox but where do I go from there? Thanks. John.