并发冲突错误

你好

在这样的代码:

SqlConnection CON1 = new SqlConnection();

CON1.ConnectionString = DATAPROVIDER.DataProvider.ConnectionString;

CON1.Open();

SqlCommand b21 = new SqlCommand("select * from " + DetailTableName);

GridEXTable _table1 = ((GridEX)ChildControl).RootTable;

SqlDataAdapter sda1 = new SqlDataAdapter(b21.CommandText, CON1);

SqlCommandBuilder cmb1 = new SqlCommandBuilder(sda1);

cmb1.GetDeleteCommand();

sda1.Update(table);

CON1.Close();