transfering item from one listbox to another

Question

private void ChangeTab ( object sender, EventArgs e ) { if ( tabControl1 . SelectedIndex == 1 ) { listBox1 . Items . Clear ( ) ; listBox2 . Items . Clear ( ) ; foreach ( Value mn in ValueList ) { listBox2 . Items . Add ( mn . getName ( ) ) ; } } if ( tabControl1 . SelectedIndex == 0 ) { listBox1 . Items . Clear ( ) ; listBox2 . Items . Clear ( ) ; foreach ( Value mn in ValueList ) { listBox1 . Items . Add ( mn . getName ( ) ) ; } } } What's the error in this code?I want to show value from listbox1 to listbox2?

Nilanka Dharmadasa · Answer

Hi Milos, Did you bind the 'ChangeTab' method to TabControl's 'SelectedIndexChanged' event? If you didnt do that, you can do that by adding following line in red to your form constructor as given below. public Form1() { InitializeComponent(); this.tabControl1.SelectedIndexChanged += new System.EventHandler(this.ChangeTab); } If you find my answer helpful, please do not forget to tick 'Do you like this answer' checkbox.

Milos · Answer

Problem solved.Thank you all!

Sam Hobbs · Answer

Okay well I don't know what ValueList is but note that you clear both listboxes before adding values to one of them, so if you are trying to copy the contents of one listbox to the other listbox and if ValueList is the contents of one of the listboes, then perhaps there is no data to copy since you cleared both listboxes.

Milos · Answer

When I change tabpage,value from listbox1, need to show in listbox2. I offered to do that with code above,but listbox2 don't accept value. J don't know why? My english is problematical,don't take amis.

Sam Hobbs · Answer

The way that forums such as this work is that you tell us the problem and then someone helps you solve the problem. Most people that try to help are not psychic; we need to know what the error is. If you can tell us the error message then someone will help solve the problem.