Enable/Disable Textbox on Current-BindingSource-Item

Enable/Disable Textbox on Current-BindingSource-Item

• matt_uk

  Did you create a HasRowsChanged method If you don't provide change notification then the databinding won't read the property again.

  -mark
  Program Manager
  Microsoft
  This post is provided "as-is"

  
  

• Thomas82

  the help file is wonderful. . .

  BindingSource.Current Property

  BindingSource.CurrentItemChanged Event

  BindingSource.DataSourceChanged Event

  
  
  

• Gordon Hogenson

  hello again.
  
  Is there any possible solution for this
  
  I did not find any, yet.
  
  Please help me on this one!
  
  thank you!
  
  

• brunic

  Check out the docs: http://msdn2.microsoft.com/en-us/library/xz45s2bh.aspx and http://msdn2.microsoft.com/en-us/library/ms229615.aspx

  -mark
  Program Manager
  Microsoft
  This post is provided "as-is"

  
  

• Mubarak

  Hello again,
  i created the following class:
  
  class myBindingSource : BindingSource
  {
  public object mxtest = false;
  public EventHandler testChanged;
  
  public object test
  {
  get
  {
  return mxtest;
  }
  set
  {
  if (test != value)
  {
  mxtest = Convert.ToBoolean(value);
  OntestChanged();
  }
  }
  }
  
  
  private void OntestChanged()
  {
  if (testChanged != null)
  {
  testChanged(this, new EventArgs());
  }
  }
  }
  

• Mehfuz Hossain

  Instinct was telling me that you could do this  -

  add a property "HasRows" to your form where it returns true if the datasource is not null and the datsource has rows

  in your constructor add -

  myTextBox.DataBindings.Add("Enabled", this, "HasRows");

  I tried it, though, and it doesn't work. Typically, I wouldn't post a non-working response, but I think it needs to be explained why this doesn't work.

  
  
  

• shajahan

  Did you create a HasRowsChanged method

  I am not sure I understand, an example would be nice. . .  I will give the outline, please fill in the missing method, if you dont mind.

  ---

  public partial class Form1 : Form
  {
      public Form1()
      {
          InitializeComponent();
          textBox1.DataBindings.Add("Enabled", this, "HasRows");
      }
      
      public bool HasRows
      {
          get { return fooBindingSource.Count > 0; }
      }
      
      private void button1_Click(object sender, EventArgs e)
      {
          fooBindingSource.Add(new foo());
      }
      
      private void button2_Click(object sender, EventArgs e)
      {
          fooBindingSource.Remove(fooBindingSource.Current);
      }
  }
     
  public class foo
  {
      int _i = 0;
      public int I
      {
          get { return _i; }
          set { _i = value; }
      }
  }

  ---

  but I think back to the original poster's question, it isn't as simple as handling it via an event (one line of code vs. a property, a method, and a DataBindings.Add statement)

  
  
  

• Lakshan Fernando

  hi,
  
  thank you for your answers!
  
  as far as i can see, all of that means, I can bind to a property. But there has to be a changed event.
  
  but in that case i have to write one for bindingsource.current. how is that possible
  
  Blair, ok, this might be a bit oversized for my sample, but i think something generic could be implemented. extending the bindingsource-class or whatever.
  
  This situation (described in the first post) is very often in my application. So i dont want to implement the same events for every bindingsource.
  
  thank you for any further tips!
  
  
  
  
  

• Richard Grant

  hello,
  
  thank you for your answer.
  
  But thats not what I am looking for.
  
  I tought of something like "bind" this property to something. Not set it in some event(s).
  
  perhaps there is a way to do this like that
  
  thank you.
  
  

• sachin.pithode

  sorry, i was wrong: the error says
  "Cannot bind to property or column test on DataSource.
  Parametername: dataMember"
  
  
  
  
• Enable/Disable Textbox on Current-BindingSource-Item