Transpose a DataTable from Rows to Column

public static DataTable GetInversedDataTable(DataTable table, string columnX, string columnY, string columnZ)
        {
            //Create a DataTable to Return
            DataTable returnTable = new DataTable();

            //Add a Column at the beginning of the table
            returnTable.Columns.Add(columnY);

            //Read all DISTINCT values from columnX Column in the provided DataTale
            List<string> columnXValues = new List<string>();

            foreach (DataRow dr in table.Rows)
            {
                string columnXTemp = dr[columnX].ToString();
                if (!columnXValues.Contains(columnXTemp))
                {
                    //Read each row value, if it's different from others provided, add to the list of values and creates a new Column with its value.
                    columnXValues.Add(columnXTemp);
                    returnTable.Columns.Add(columnXTemp);
                }
            }

            //Verify if Y and Z Axis columns re provided
            if (columnY != "" && columnZ != "")
            {
                //Read DISTINCT Values for Y Axis Column
                List<string> columnYValues = new List<string>();

                foreach (DataRow dr in table.Rows)
                {
                    if (!columnYValues.Contains(dr[columnY].ToString()))
                        columnYValues.Add(dr[columnY].ToString());
                }

                //Loop all Column Y Distinct Value
                foreach (string columnYValue in columnYValues)
                {
                    //Creates a new Row
                    DataRow drReturn = returnTable.NewRow();
                    drReturn[0] = columnYValue;
                    //foreach column Y value, The rows are selected distincted
                    DataRow[] rows = table.Select(columnY + "='" + columnYValue + "'");

                    //Read each row to fill the DataTable
                    foreach (DataRow dr in rows)
                    {
                        string rowColumnTitle = dr[columnX].ToString();

                        //Read each column to fill the DataTable
                        foreach (DataColumn dc in returnTable.Columns)
                        {
                            if (dc.ColumnName == rowColumnTitle)
                            {
                                drReturn[rowColumnTitle] = dr[columnZ];
                            }
                        }
                    }
                    returnTable.Rows.Add(drReturn);
                }
            }
            else
            {
                throw new Exception("The columns to perform inversion are not provided");
            }
            return returnTable;
        }

You can use this method for transforming your data table. You need to pass following values to parameters

table: Your Datatable

columnX: "DATE"

columnY: "PRODUCT"

columnZ: "QTY"

This is a generic method, you can use it for any data table. You just need to pass columns value as parameter. You can also customize this method only specific to this data table if you want to add "BRANCH" as last column.

Please let me know if it solves your problem.

Reply

Zhi Lv - MSF...

All-Star

45489 Points

7008 Posts

Microsoft

Re: Transpose a DataTable from Rows to Column

Mar 13, 2015 02:33 AM|Zhi Lv - MSFT|LINK

Hi vinovasu,

As for this issue, I suppose you need to create a new DataTable with the following columns and loop through the original DataTable.

Columns: PRODUCT 02150301 02150302 02150303 BRANCH

You could refer to the following code:

            //Create new table
            DataTable Newdt = new DataTable();
            Newdt.Columns.AddRange(new DataColumn[5] { new DataColumn("PRODUCT"), new DataColumn("02150301"), new DataColumn("02150302"), new DataColumn("02150303"), new DataColumn("BRANCH") });

            ViewState["newTable"] = Newdt;

            var pp = (from ee in dt.AsEnumerable()
                      select ee.Field<string>("PRODUCT")).Distinct();

            foreach (var item in pp)
            {
                InsertValueToTable(dt, item);
            }

            GridView2.DataSource = (DataTable)ViewState["newTable"];
            GridView2.DataBind();

        private void InsertValueToTable(DataTable dt, string parm)
        {
            var query = from cc in dt.AsEnumerable()
                        where cc.Field<string>("PRODUCT") == parm
                        select new
                        {
                            Date = cc.Field<string>("DATE"),
                            Branch = cc.Field<string>("BRANCH"),
                            Qty = cc.Field<string>("QTY"),
                        };

            string s1 = "";
            string s2 = "";
            string s3 = "";
            foreach (var item in query)
            {
                if (item.Date == "02150301")
                {
                    s1 = item.Qty;
                }
                else if (item.Date == "02150302")
                {
                    s2 = item.Qty;
                }
                else if (item.Date == "02150303")
                {
                    s3 = item.Qty;
                }
            }
            DataTable newDT = (DataTable)ViewState["newTable"];
            newDT.Rows.Add(parm, s1, s2, s3, "CHENNAI");
        }

The output:

Note: The above code just apply to the table in your post.

Best Regards,
Dillion

.NET forums are moving to a new home on Microsoft Q&A, we encourage you to go to Microsoft Q&A for .NET for posting new questions and get involved today.

Reply

vinovasu

Member

6 Points

35 Posts

Re: Transpose a DataTable from Rows to Column

Mar 14, 2015 10:23 AM|vinovasu|LINK

Thanks for your response Zhi LV, but i'm using dynamic dates. so how to add dynamic dates into "Newdt" Datatable.

Reply

Zhi Lv - MSF...

All-Star

45489 Points

7008 Posts

Microsoft

Re: Transpose a DataTable from Rows to Column

Mar 15, 2015 08:21 PM|Zhi Lv - MSFT|LINK

Hi vinovasu,

As indicated in my provious reply, the previous code just apply to the table in your earlier post.

As for the dynamic dates, do you mean the new datatable columns like this:

Columns: PRODUCT 02150301 02150302 02150303 02150304 … BRANCH

As for this scenario, I suppose you need to dynamic create the new datatable with
apove columns. Here are some samples, you could refer to them.
http://www.codeproject.com/Articles/44274/Transpose-a-DataTable-using-C
http://forums.asp.net/t/1822478.aspx?Convert+DataTable+From+Rows+To+Columns

Best Regards,
Dillion

.NET forums are moving to a new home on Microsoft Q&A, we encourage you to go to Microsoft Q&A for .NET for posting new questions and get involved today.

Reply

vinovasu

Member

6 Points

35 Posts

Re: Transpose a DataTable from Rows to Column

Mar 17, 2015 03:33 AM|vinovasu|LINK

Thanks Guys

Transpose a DataTable from Rows to Column[Answered] RSS

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