private void button2_Click(object sender, EventArgs e) { string requete; if (textBox2.TextLength>0) { requete += string.Format("# matricule like '%{0}%' #", textBox2.Text); } if (textBox3.TextLength>0) { requete += string.Format("# nom like '%{0}%' #", textBox3.Text); } if (textBox4.TextLength>0) { requete += string.Format("# prenom like '%{0}%' #", textBox4.Text); } requete = requete.Replace("##","OR").Replace("#",string.Empty); aGENTBindingSource.Filter = requete; }