如何判断DataTable一行是否存在？
比如datatable.item(i)这一行是否怎么判断呢？如果不用rows.count方法的话。
[解决办法]
datatable.item(i)一般是在获取rows.count之后使用for遍历，如果必须直接调用那可以写进错误处理模块里：
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim aa As DataTable
aa = New DataTable()
Dim i As Integer
For i = 0 To 100
Try
MsgBox(aa.Rows(i).ToString)
Catch ex As Exception
MsgBox( "没有找到行 ")
End Try
Next
End Sub
End Class
