access 数据库连接问题
给位高手,本人刚学c#,连接数据库出问题,找不到问题所在,帮帮啊
string ConStr =@"Provider=Microsoft.Jet.OLEDB.4.0;Data source=d:\dir.mdb";
OleDbConnection con= new OleDbConnection(ConStr);
string cmdStr = "select * from [bzj] where [xm] =" + " '" + this.textBox1.Text + "' " + " and [mm]=" + " '" + textBox2.Text + "' ";
OleDbCommand cmd = new OleDbCommand(cmdStr,con);
con.Open();
OleDbDataReader reader = cmd.ExecuteReader();
系统提示:至少一个参数没有被指定值。如果不带“where”子句,可以正常通过的