linq group & sum query -

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My single unit is a framework object that represents a telephone call.

How can I group the dialed numbers? {Number = xxx, durationSum = yyy} by period and project

I am a linq novice and can not get it properly.

I think you want something like this: 

  var Query = db in call Call group calls by call. Select the number in the new {number = g.Key, avadhisham = g. SUM (c => d. Duration)};

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