Try This.
Select Content Type Form
private List<string> _selectedItems = new List<String>();
public List<string> SelectedItem
{
get {return _selectedItems;}
}
private void btnSelect_Click(object sender, EventArgs e)
{
for(int i=0; i<lst.Items.Count;i++)
{
if (lstContenType.GetItemCheckState(i) == CheckState.Checked)
_selectedItems.Add(lst.Items[i].ToString());
}
this.Close();
}
Create List Form
private void rdoEnableCntType_Checked(object sender, EventArgs e)
{
if (rdoEnableCntType.Checked = true)
{
FrmConentType frm = new FrmConentType();
frm.ShowDialog();
List<string> list = frm.SelectedItems;
//Place your code to use selected items
}
}