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Using a textbox or label like a button in c# visual studio
private void txtBox_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
    TextBox txtbx = sender as TextBox;
    if (txtbx != null)
    {
        if (txtbx.SelectionLength > 0)
        {
            string seltxt = txtbx.SelectedText;
            //Do Work Here with 'seltxt' variable!
        }
    }
}

private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
      {
        MessageBox.Show("you have clicked a link label");
        //or whatever action you want it to do.
      }