再次单击按钮时，请有人我在此代码中有错误.

问题描述

con = new SqlConnection(str);
            con.Open();
            string combined = "select code_customer,insurance_type,branch_name,name,address,insurance_cost,record_date  from customers,branches,insurance_type where branches.code_branch=customers.code_branch and insurance_type.code_type=customers.code_type";
            dset = new DataSet();
            da = new SqlDataAdapter(combined, con);
            da.Fill(dset, "customers");
            builder = new SqlCommandBuilder(da);
            dataGridView1.DataSource = dset.Tables["customers"];
            comboBox1.DataSource = dset.Tables["customers"];
            comboBox1.DisplayMember = "insurance_type";
            comboBox2.DataSource = dset.Tables["customers"];
            comboBox2.DisplayMember = "branch_name";
            textBox1.DataBindings.Add("Text",dset.Tables["customers"], "name");
            textBox2.DataBindings.Add("Text",dset.Tables["customers"], "address");
            textBox3.DataBindings.Add("Text",dset.Tables["customers"], "insurance_cost");
            dateTimePicker1.DataBindings.Add("value", dset.Tables["customers"], "record_date");.

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