Question

I used the same TextChanged event handler for 2 textboxs so Is their any performance improvement or it is just matter of readability?

Method 1

private void txtcode_TextChanged(object sender, EventArgs e)
        {
        //Some code
        }
private void txtname_TextChanged(object sender, EventArgs e)
        {
        //Some code
        }

Method 2

private void txt_TextChanged(object sender, EventArgs e)
    {
        TextBox txtbx = (TextBox)sender;
        switch (txtbx.Name)
        {
            case "txtname":
                //Some code
                break;

            case "txtcode":
                //Some code
                break;

            default:
                break;
        }

    }

Answer 1

Method 1

will be better, as they are direct and knows for that control they are responding too

Regarding

Method 2

each time the sender(object) is casted to TextBox and then the switch statement decides the Operation on the control.

so it is obvious that, Method1 will be more effective

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Have a look at these links too : How expensive is Casting, Performance of Typecasting