查询的一个问题？

string Mycon = "provider=Microsoft.Jet.OLEDB.4.0; Data Source=Northwind.mdb";
            string Sql = "select * from 客户 where 联系人姓名='"+ this.textBox2.Text.Trim() + "'";
            oleDbConnection1 = new System.Data.OleDb.OleDbConnection(Mycon);
            dataSet1 = new DataSet();
            oleDbDataAdapter1 = new System.Data.OleDb.OleDbDataAdapter(Sql, oleDbConnection1);
            oleDbConnection1.Open();
            oleDbDataAdapter1.Fill(dataSet1, "客户");
            this.textBox1.DataBindings.Add("Text", this.dataSet1, "客户.客户ID");
            this.textBox2.DataBindings.Add("Text", this.dataSet1, "客户.公司名称");
            this.textBox3.DataBindings.Add("Text", this.dataSet1, "客户.联系人姓名");
            this.textBox4.DataBindings.Add("Text", this.dataSet1, "客户.联系人头衔");
            this.textBox5.DataBindings.Add("Text", this.dataSet1, "客户.联系地址");
            this.MyBind = this.BindingContext[this.dataSet1, "客户"];
            oleDbConnection1.Close();
做的是一个查询姓名的　我想输入一个姓名　点下查询然后在文本框显示这个人的资料
　　　可是遇到了错误　麻烦帮改一下　
　错误图片不知怎么的　传不上来　大概意思就是＂这将导致集合的两个邦定绑定到同一个属性，参数名binding