对数据库进行插入操作，提示错误（图）开发工具：Visual Studio 2012（.NET 4.5）数据库：Access 2003 代码：
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim con As OleDbConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & lujing.Text)
con.Open()
Dim cmd As New OleDbCommand(mingling.Text, con)
cmd.ExecuteNonQuery()
End Sub 说明： lujing.Text是数据库路径
mingling.Text是SQL语句：INSERT INTO userlist (ID,用户名) VALUES (9,ninth)

首先你要先确定下是Open出错还是cmd.ExecuteNonQuery()出错

我觉得你的SQL语句应该做个修改
改成cmd.CommandText="INSERT INTO userlist (ID,用户名) VALUES ('9','ninth')"