To know enter is pressed on leave event of ComboBox

Thanks zoran it helped me so much

did same and i declare this 2 variable globally
 bool _isEnterPressed ;
        bool enterPressed;


protected override bool ProcessDialogKey(Keys keyData)
        {
             switch (keyData)
          

            { 
                  
                    case Keys.Enter:
                    enterPressed = _isEnterPressed;
                   _isEnterPressed = false;
                    return base.ProcessDialogKey(Keys.Tab);
                  
            }

          
            return base.ProcessDialogKey(keyData);
          
        }


 private void comboBox5_Leave(object sender, EventArgs e)
        {
            if (radioButton2.Checked)
            {
                if (enterPressed == true & comboBox5.Text == "")
                {
            //now control is not coming here in any condition
                    medicinerpt m = new medicinerpt();
                    m.pid = int.Parse(comboBox9.Text);
                    m.d1 = dateTimePicker4.Value.ToString();
                    m.Dock = DockStyle.Fill;
                    Reports v = new Reports();
                    v.Text = "Medicines";
                    v.panel1.Controls.Clear();
                    v.panel1.Controls.Add(m);
                    v.Show();

                }
                else
                  

                  comboBox4.Focus();
               
                 
            }
}

Sorry, I didn't notice one more detail - you must clear _isEnterPressed unconditionally. In the code above comboBox5's contents may cause the flag to stay true. So modify your code in Leave handler like this:

bool enterPressed = _isEnterPressed;
_isEnterPressed = false;        // Clear the flag unconditionally; previous value is remembered in local variable

if (radioButton2.Checked)
{
    if (enterPressed == true & comboBox5.Text == "")
    {
        medicinerpt m = new medicinerpt();
        m.pid = int.Parse(comboBox9.Text);
        m.d1 = dateTimePicker4.Value.ToString();
        m.Dock = DockStyle.Fill;
        Reports v = new Reports();
        v.Text = "Medicines";
        v.panel1.Controls.Clear();
        v.panel1.Controls.Add(m);
        v.Show();
    }
    else
        comboBox4.Focus();
}

i did like this
protected override bool ProcessDialogKey(Keys keyData)
  {
  switch (keyData)
 

  { 
 
  case Keys.Enter:
  _isEnterPressed = true;
  return base.ProcessDialogKey(Keys.Tab);
 
  }

 
  return base.ProcessDialogKey(keyData);
 
  }


leave event of combobox

 if (radioButton2.Checked)
  {
  if (_isEnterPressed == true & comboBox5.Text == "")
  {
  _isEnterPressed = false;
  medicinerpt m = new medicinerpt();
  m.pid = int.Parse(comboBox9.Text);
  m.d1 = dateTimePicker4.Value.ToString();
  m.Dock = DockStyle.Fill;
  Reports v = new Reports();
  v.Text = "Medicines";
  v.panel1.Controls.Clear();
  v.panel1.Controls.Add(m);
  v.Show();
 
  }
  else
  comboBox4.Focus();
  }

wasee the error i am doing exactly as you said

You've mixed = and == - in if statement, you must test the value using ==, in code block you should set it to false using =. Copy the code from my previous post exactly.

Zoran

when i did _isEnterPressed == true. in  leave event handler
it is giving error
only assignment,call,increament,decreament can be used as statement

First, in Leave handler you have placed _isEnterPressed = true, but should be _isEnterPressed == true.

Second, first thing in "my code" part should be _isEnterPressed = false. That would do it.

Something like this:

private void comboBox5_Leave(object sender, EventArgs e)
{
    if (_isEnterPressed == true & comboBox5.Text == "")
    {
        _isEnterPressed = false;
        // my code
    }
}

Zoran

zaran still i am  not getting 
i did
            private void comboBox5_Leave(object sender, EventArgs e)
        {
           
                if (_isEnterPressed = true & comboBox5.Text == "")
                {
                   my code
                }
    }

and to move on enter click between controls i am using following code and here i am setting  _isEnterPressed to true

 protected override bool ProcessDialogKey(Keys keyData)
        {
            switch (keyData)
            {
                    case Keys.Enter:
                    _isEnterPressed = true;
                    return base.ProcessDialogKey(Keys.Tab);
            }

          
            return base.ProcessDialogKey(keyData);
          
        }

As said in point 3, you clear it in Leave event handler as soon as you detect it's true.

In that way you're completing the cycle - flag is set only if Enter is pressed AND Leave event is about to be raised, and it is cleared in the Leave event handler which is invoked immediately and synchronously from inside the Enter key press handler. Hence there is no fear that any other entity could interfere with the flag and cause it to be misinterpretted in the Leave handler.

Zoran

zoran each time condition will be true as if i set boolean value to true when should i make it false

1. Create a Boolean field named, say, bool _isEnterPressed.
2. Set it to true when Enter is pressed and you move focus to other control (which will cause Leave event to be raised).
3. In Leave event handler test the _isEnterPressed field and do appropriate action, but make sure that clearing it to false is the first thing to do after testing.

Zoran