C# 错误：未实现操作not方法

我希望将datatable从数据库加载到数据网格视图，但我得到的错误是“操作和方法未实现”。我确实在这里回顾了视频：；这是我第一次这么做，希望能解决它

下面是我的代码：

private void button1_Click(object sender, EventArgs e)
    {
        string constring = @"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\oo\Documents\Data.mdf;Integrated Security=True;Connect Timeout=30";
        MySqlConnection conDataBase = new MySqlConnection(constring);
        MySqlCommand cmdDataBase = new MySqlCommand("SELECT* from Data.itemInfo;", conDataBase);

        try
        {
            MySqlDataAdapter sda = new MySqlDataAdapter();
            sda.SelectCommand = cmdDataBase;
            DataTable dbdataset = new DataTable();
            sda.Fill(dbdataset);
            BindingSource bSource = new BindingSource();

            bSource.DataSource = dbdataset;
            dataGridView1.DataSource = bSource;
            sda.Update(dbdataset);
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

您的Sql查询包含额外的半圈

从

到

---

我已经添加了这个，它会返回“Tables”和“DataBind”的红线，然后我添加了“using System.Data.DataTable；using System.Windows.Forms.DataGridView；”，它不起作用。。。

MySqlCommand cmdDataBase = new MySqlCommand("SELECT* from Data.itemInfo;", conDataBase); 

SELECT* from Data.itemInfo;

SELECT* from Data.itemInfo