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You are creating a DataTable. You use the following code segment to create the DataTable. (Line numbers are included for reference only.)01 DataTable dt = new DataTable(Products”);02 dt.Columns.Add(new DataColumn(Price”, typeof(decimal)));03 dt.Columns.Ad

题目

You are creating a DataTable. You use the following code segment to create the DataTable. (Line numbers are included for reference only.)01 DataTable dt = new DataTable(Products”);02 dt.Columns.Add(new DataColumn(Price”, typeof(decimal)));03 dt.Columns.Add(new DataColumn(Quantity”, typeof(Int32)));04 DataColumn dc = new DataColumn(Total”, typeof(decimal));05 dt.Columns.Add(dc);You need to ensure that the Total column is set to the value of the Price column multiplied by the Quantity column when new rows are added or changed. What should you do? （）

A. Add the following code segment after line 05. dc.ExtendedProperties["Total"] = "Price * Quantity”;

B. Add the following code segment after line 05. dc.Expression = “Prince * Quantity”;

C. Write an event handler for the DataTable‘s TableNewRow event that updates the row‘s Total.

D. Write an event handler for the DataTable‘s ColumnChanged event that updates the row‘s Total.

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参考答案和解析
参考答案：B
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    ()Modern logistics is more about effective and efficient flow of materials and information.

    A、 Yes, you’re right

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    参考答案：C

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    – David, you've been losing your temper over nothing lately.– ( ).

    A. I haven’t been getting much sleep either

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    正确答案:C

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    Me,you是两个初始集合，则下列关于派生集合定义方式正确的是

    A．link/me,you/:a;

    B．link(me,you):a;

    C．link/me you/a;

    D．link(me,you)/a;


    link(me,you):a;

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    You’re such a hardworking student, you()the praise.

    A、reserve

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    C、conserve

    D、preserve


    正确答案：B

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    You've misspelled this word again.You'd better look it up ()

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    参考答案：对

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