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    <p>Firstly, I suggest you try to use a Dictionary or any other generic collection instead of an ArrayList to make it type-safe. Then use a string.Split(char c) and start the processing from there.</p> <p>Here's an idea on how you can do it. It might get shorter with Extension methods of course. But here's just a thought-process on how you can do it.</p> <pre><code> static void ParseSupplierIdWithProducts() { string supplierIdWithProducts = "1_1001,1_1002,20_1003,100_1005,100_1006"; //eg. [0] = "1_1001", [1] = "1_1002", etc List&lt;string&gt; supplierIdAndProductsListSeparatedByUnderscore = supplierIdWithProducts.Split(',').ToList(); //this will be the placeholder for each product ID with multiple products in them //eg. [0] = key:"1", value(s):["1001", "1002"] // [1] = key:"20", value(s):["1003"] Dictionary&lt;string, List&lt;string&gt;&gt; supplierIdWithProductsDict = new Dictionary&lt;string, List&lt;string&gt;&gt;(); foreach (string s in supplierIdAndProductsListSeparatedByUnderscore) { string key = s.Split('_')[0]; string value = s.Split('_')[1]; List&lt;string&gt; val = null; //look if the supplier ID is present if (supplierIdWithProductsDict.TryGetValue(key, out val)) { if (val == null) { //the supplier ID is present but the values are null supplierIdWithProductsDict[key] = new List&lt;string&gt; { value }; } else { supplierIdWithProductsDict[key].Add(value); } } else { //that supplier ID is not present, add it and the value/product supplierIdWithProductsDict.Add(key, new List&lt;string&gt; { value }); } } } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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