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PODataTable group the result in one row
 

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    <p>I have a DataTable and want to group Name, LastName and Comment. The rest should be in the same row. In my Code firstly i make ID's values as header and then organize the Attribute values to each ID. What I want here is to group the the same Name, Lastname and Comment with their ID values. My first Table looks like that:</p> <pre><code>ID Name Lastmame Comment Attribute 1 kiki ha hello FF 3 lola mi hi AA 2 ka xe what UU 2 kiki ha hello SS </code></pre> <p>After I use my code:</p> <pre><code> Name Lastname Comment 1 3 2 kiki ha hello FF lola mi hi AA ka xe what UU kiki ha hello SS </code></pre> <p>What I want to have is:</p> <pre><code> Name Lastname Comment 1 3 2 kiki ha hello FF SS lola mi hi AA ka xe what UU </code></pre> <p>My Code:</p> <pre><code>DataTable table1 = new DataTable("Kunde"); table1.Columns.Add("Comment", typeof(String)); table1.Columns.Add("Name", typeof(String)); table1.Columns.Add("Lastname", typeof(String)); DataTable comment = new DataTable("Comment"); comment.Columns.Add("ID", typeof(String)); comment.Columns.Add("Comment", typeof(String)); comment.Columns.Add("Attribute", typeof(String)); DataSet ds = new DataSet("DataSet"); ds.Tables.Add(table1); ds.Tables.Add(comment); object[] o1 = { "hello", "kiki", "ha" }; object[] o2 = { "hi", "lola", "mi" }; object[] o3 = { "what", "ka", "xe" }; object[] c1 = { 1, "hello", "FF" }; object[] c2 = { 3, "hi", "AA" }; object[] c3 = { 2, "what", "UU" }; object[] c4 = { 2, "hello", "SS" }; table1.Rows.Add(o1); table1.Rows.Add(o2); table1.Rows.Add(o3); comment.Rows.Add(c1); comment.Rows.Add(c2); comment.Rows.Add(c3); comment.Rows.Add(c4); var results = from tb1 in comment.AsEnumerable() join tb2 in table1.AsEnumerable() on tb1.Field&lt;string&gt;("Comment") equals tb2.Field&lt;string&gt;("Comment") select new { ID = tb1.Field&lt;String&gt;("ID"), Name = tb2.Field&lt;String&gt;("Name"), Lastname = tb2.Field&lt;String&gt;("Lastname"), Comment = tb1.Field&lt;String&gt;("Comment"), Attribute = tb1.Field&lt;String&gt;("Attribute"), }; DataTable result = LINQToDataTable(results); var products = result.AsEnumerable() .GroupBy(c =&gt; c["ID"]) .Where(g =&gt; !(g.Key is DBNull)) .Select(g =&gt; (string)g.Key) .ToList(); var newtable = result.Copy(); products.ForEach(p =&gt; newtable.Columns.Add(p, typeof(string))); foreach (var row in newtable.AsEnumerable()) { if (!(row["ID"] is DBNull)) row[(string)row["ID"]] = row["Attribute"]; } newtable.Columns.Remove("ID"); newtable.Columns.Remove("Attribute"); var result11 = from t1 in newtable.AsEnumerable() group t1 by new { Name = t1.Field&lt;String&gt;("Name"), LastName = t1.Field&lt;String&gt;("LastName"), Comment = t1.Field&lt;String&gt;("Comment"), } into grp select new { Name = grp.Key.Name, LastName = grp.Key.LastName, Comment = grp.Key.Comment, //Something here }; </code></pre> <p><code>LINQToDataTable</code> method definition</p> <pre><code>using System.Reflection; public DataTable LINQToDataTable&lt;T&gt;(IEnumerable&lt;T&gt; varlist) { DataTable dtReturn = new DataTable(); // column names PropertyInfo[] oProps = null; if (varlist == null) return dtReturn; foreach (T rec in varlist) { if (oProps == null) { oProps = ((Type)rec.GetType()).GetProperties(); foreach (PropertyInfo pi in oProps) { Type colType = pi.PropertyType; if ((colType.IsGenericType) &amp;&amp; (colType.GetGenericTypeDefinition() == typeof(Nullable&lt;&gt;))) { colType = colType.GetGenericArguments()[0]; } dtReturn.Columns.Add(new DataColumn(pi.Name, colType)); } } DataRow dr = dtReturn.NewRow(); foreach (PropertyInfo pi in oProps) { dr[pi.Name] = pi.GetValue(rec, null) == null ? DBNull.Value : pi.GetValue (rec, null); } dtReturn.Rows.Add(dr); } return dtReturn; } </code></pre>
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