asp.net访问Access数据库溢出错误

private int GetReturnValue(string sStr, string conn) {
OleDbConnection odbcOnn= AccessHelp(conn);
OleDbCommand odbcmd = new OleDbCommand(sStr, odbconn);
return odbcmd.ExecuteNonQuery();
}

public int wsbm(string[] str) {
StringBuilder sb=new StringBuilder();
sb.Append("INSERT INTO ").Append("wsbm(zy, studentname, parentname)");
sb.Append(" VALUES (");
sb.Append("'" + str[0] + "', '" + str[1] + "', '" + str[2] + "'");
sb.Append(")");
return GetReturnValue(sb.ToString(), "ODBconn");
}

protected void Bttj_Click(object sender, EventArgs e) {
string[] sStr = new string[] {
this.ddlzy.SelectedItem.Text,
this.tbName.Text,
this.tbbb.Text,
};
if (ad.wsbm(sStr) > 0) {
Response.Write("");
}
}