Question

I have a Form on which there are two controls, a Button and a TextBox.
These controls are created at runtime.

When I click the Button, I want to do some operations with the TextBox.Text property.
But, with this code I can’t:

 private void Form1_Load(object sender, EventArgs e)
 {
     TextBox txb = new TextBox();
     this.Controls.Add(txb);
     Button btn = new Button();
     this.Controls.Add(btn);
     btn.Click += new EventHandler(btn_Click);
 }

Here I’m trying to find it:

public void btn_Click(object sender, EventArgs e)
{
    foreach (var item in this.Controls)
    {
        if (item is TextBox)
        {
            if (((TextBox)item).Name=="txb")
            {
                MessageBox.Show("xxx");
            }
        }
    }
}

Answer 1

You don’t have a Textbox with Name “txb”. so, this expression will always be false: if(((TextBox)item).Name=="txb")

try this codes:

private void Form1_Load(object sender, EventArgs e)
 {
     TextBox txb = new TextBox();
     txb.Name = "txb";
     this.Controls.Add(txb);
     Button btn = new Button();
     this.Controls.Add(btn);
     btn.Click += new EventHandler(btn_Click);
 }