//声明一个SQLconnection对象
SqlConnection sql = new SqlConnection(constr);
SqlDataAdapter sda = new SqlDataAdapter("select * from Department", sql);
DataSet ds = new DataSet();
sda.Fill(ds, "DeptName");//数据库列名
comboBox1.DataSource = ds.Tables["DeptName"];//数据库列名
SqlConnection sql = new SqlConnection(constr);
SqlDataAdapter sda = new SqlDataAdapter("select * from Department", sql);
DataSet ds = new DataSet();
sda.Fill(ds, "DeptName");//数据库列名
comboBox1.DataSource = ds.Tables["DeptName"];//数据库列名
comboBox1.DisplayMember = "DeptName";//数据库列名