how to avoid button click event when enter the textbox on textchanged event in asp .Net

Hi,

You can use this method to check whether enter key is pressed or not.

private void OnKeyDownHandler(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Return)
    {
        textBlock1.Text = "You Entered: " + textBox1.Text;
    }
}

or you have to try client side scripts in this way on onkeypress.

function (event) {
        if (event.which == 13 || event.keyCode == 13) {
            //code to execute here
            return false;
        }
        return true;
    });

Implement it according to your need.

Good Luck