Asp.net 在VB.NET中显示警报消息

在我的服务器端代码中，我需要显示一条警告消息，并在满足特定条件时停止页面的执行。执行停止，但我没有收到警报消息。我错过了什么？我的代码是这样的

Try
        If txtAmtRequested.Text > Val(HiddenTotalFeeAmount.Value) Then
            ScriptManager.RegisterClientScriptBlock(Me, GetType(Page), UniqueID,
            "javascript:alert('Total Fee Amount set for this student is - '" & HiddenTotalFeeAmount.Value & "'... Enter Concession Amount lesser than this one..!')", True)
                Exit Function
            End If
        Catch ex As Exception

        End Try

试试这个：

Try
    If txtAmtRequested.Text > Val(HiddenTotalFeeAmount.Value) Then
        ScriptManager.RegisterClientScriptBlock(Me, GetType(Page), UniqueID,
        "javascript:alert('Total Fee Amount set for this student is - " & HiddenTotalFeeAmount.Value & "... Enter Concession Amount lesser than the..!');", True)
            Exit Function
        End If
    Catch ex As Exception

    End Try

在插入值时，您在javascript中结束了字符串，导致以下javascript：

javascript:alert('Total Fee Amount set for this student is - ' <Value> '... Enter Concession Amount lesser than the..!');

javascript:alert（'为该学生设置的总费用金额为-''，请输入低于..的优惠金额！'）；

与此相反，您必须将值直接插入字符串，或在字符串中添加“+”：

 javascript:alert('Total Fee Amount set for this student is - <Value> ... Enter Concession Amount lesser than the..!');

javascript:alert（'为该学生设置的总费用金额为-…输入低于..的优惠金额！'）；

或

javascript:alert（'为该学生设置的总费用金额为-'+'…输入低于..！'的优惠金额）；

javascript:alert('Total Fee Amount set for this student is - ' + <Value> + '... Enter Concession Amount lesser than the..!');