private void btnStudent_Seach_Click(object sender, EventArgs e) { if (Radiobtn_FullName_student.Checked == false && Radiobtn_ClassName.Checked == false) { return; } if (Radiobtn_FullName_student.Checked == true) { dt_student.DataSource = BUS_Admin.SearchingForStudentWithName(txtSearch_student.Text, conStrSettings, lbPage_student); } if (Radiobtn_ClassName.Checked == true) { dt_student.DataSource = BUS_Admin.SearchingForStudentWithClass(txtSearch_student.Text, conStrSettings, lbPage_student); } }