How to create dyanmic textbox with keydown event

Question

Hi,

Need to create a dynamic textbox with keydown and textchanged events. pls help me.

Thanks in advance.

 

Answer 1

Hi.

Here you go:

      TextBox tb = new TextBox();
      tb.KeyDown += new KeyEventHandler(tb_KeyDown);
      tb.TextChanged += new EventHandler(tb_TextChanged);

    void tb_TextChanged(object sender, EventArgs e)
    {
      // DO ACTIONS
    }

    void tb_KeyDown(object sender, KeyEventArgs e)
    {
       // DO ACTIONS
    }

Noam B
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Answer 2

Hi,

Try to use the code given by Noam. Also you need to add the dynamic textbox control to the Form's Controls collection. For example,

private void button1_Click(object sender, EventArgs e)
{
  TextBox tb1 = new TextBox();
  tb1.Left = 100;
  tb1.Top = 100;
  tb1.KeyDown += new KeyEventHandler(TextBox_KeyDown);
  tb1.TextChanged += new EventHandler(TextBox_TextChanged);
  this.Controls.Add(tb1);
}


void TextBox_TextChanged(object sender, EventArgs e)
{
  // Code to handle TextChanged event goes here
}

void TextBox_KeyDown(object sender, KeyEventArgs e)
{
  // Code to handle KeyDown event goes here
}

Answer 3

Hi,

My doubt is if i added 5 dynamic textboxes then how to set keydown event for those 5 textboxes.

thanks in advance.

Answer 4

Hi,

Do you wan to set the same keydown event for all those 5 dynamically added textboxes or each textbox will havt its own keydown event?

You can use a common keydown event  for all 5 textboxes. You can identify each textbox using sender object. Try this following code.

private void button1_Click(object sender, EventArgs e)
{
  TextBox tb1 = new TextBox();
  tb1.Name = "tb1";
  tb1.Left = 100;
  tb1.Top = 100;
  tb1.KeyDown += new KeyEventHandler(TextBox_KeyDown);
  tb1.TextChanged += new EventHandler(TextBox_TextChanged);
  this.Controls.Add(tb1);

  TextBox tb2 = new TextBox();
  tb2.Name = "tb2";
  tb2.Left = 100;
  tb2.Top = 150;
  tb2.KeyDown += new KeyEventHandler(TextBox_KeyDown);
  tb2.TextChanged += new EventHandler(TextBox_TextChanged);
  this.Controls.Add(tb2);

  //Continue code to add 5 textboxes dynamically in the same way
}

void TextBox_KeyDown(object sender, KeyEventArgs e)
{
  // Code to handle KeyDown event goes here

  TextBox txt = (TextBox)sender;
  MessageBox.Show(txt.Name);

  switch (txt.Name)
  {
    case "tb1":
      //Write code to handle tb1 textbox
      break;

    case "tb2":
      //Write code to handle tb2 textbox
      break;

    //Write code to handle all the 5 textboxes in a separate case statement
  }
}

void TextBox_TextChanged(object sender, EventArgs e)
{
  // Code to handle TextChanged event goes here
  TextBox txt = (TextBox)sender;
  MessageBox.Show(txt.Name);

  switch (txt.Name)
  {
    case "tb1":
      //Write code to handle tb1 textbox
      break;

    case "tb2":
      //Write code to handle tb2 textbox
      break;

    //Write code to handle all the 5 textboxes in separate case statement
  }
}

 

Answer 5

Hi,

 

 i tried to add dynamic textboxes in a user control and how to set keydown event for textbox from my main project.

thanks in advance