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copied!<p>Okay, I have a solution for you; however, it contains some funky math kung fu and so I am not sure whether it is the best solution. It does, however, work with a DataGrid.</p> <pre><code>public void PopulateAndSum() { //Ugly Math Kung Fu starts here //Get the number of rows in the collection int rowCount = Items.Count; //Here you specify after how many rows should the summation occur int numRowsToSum = 6; //Now the idea is to loop through the collection the same number of times //As you would be inserting summation rows into the collection //To calculate the maximum number of times you should circulate you //divide through the number of rows and ceil the result. Make sure //divide by a double or at least cast one of them to a double so you do //not get integer division for (int i = 0; i < Math.Ceiling(((double)rowCount) / numRowsToSum); i++) { //Now you want to calculate the position where you need to insert the the new entry int index = 0; //Check whether you are still in the bounds of the array or whether you have actually reached the last element //in the array. This should always be the case if your collection contains a multiple of numRowsToSum if (numRowsToSum + i * (numRowsToSum) <= rowCount) { //The index starts at numRowsToSum because you start the collection indexing at 0 //From there you jump the next index and add one to take into account that you inserted a new element index = numRowsToSum + i*(numRowsToSum + 1); } else { //If your collection contains a number of elements that are not a precise multiple of numRowsToSum //then you have to have a special condition where you calculate the index for the last few elements //Here you need to jump back to the previous index and add the number of elements left in the collection //You also have to add 1 to take into account that you are adding an extra row. index = numRowsToSum + (i - 1) * (numRowsToSum + 1) + 1 + rowCount % numRowsToSum; } //Now you sum all the rows before the index int sum = 0; for (int j = 0; j < index; j++) { //If you want to add the previous totals to the sum comment the next part out if ((j - numRowsToSum) % (numRowsToSum + 1) == 0) continue; sum += Items[j].Value; } //Now add the entry Items.Insert(index, new Info() { Name = "Total", Value = sum }); } } </code></pre> <p><code>Items</code> is an ObservableCollection and <code>Info</code> is just a test class I created. I did comment the code quite thoroughly. It is more generic than your requirement in the sense that you can change the <code>numRowsToSum</code> to any value and it should still work.</p>

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