未处理的“System.Data.SqlClient.SqlException”类型的异常出现在 system.data.dll 中。

其他信息: 系统错误。

string connectionString="server=PC077;database=Northwind;uid=sa;pwd=;";
                Conn=new System.Data.SqlClient.SqlConnection(connectionString);
                Conn.Open();

                Comm=new System.Data.SqlClient.SqlCommand();
                Comm.Connection=Conn;
                 CompanyName,tontactName from Coutomers";

                Da=new System.Data.SqlClient.SqlDataAdapter();
                Da.SelectCommand=Comm;
                Da.TableMappings.Add("Table","Coutomers");

                DataSet Ds=new DataSet();
                Ds.CaseSensitive=true;
    
                Da.Fill(Ds);
            
        
                Dg.DataSource=Ds.Tables["Coutomers"].DefaultView;