Help with sum in datatable

Johny Bravo
Johny Bravo used Ask the Experts™
on

Hi Experts,
please have a look for the data I am having in datatable.Actually it is pivoted to get the data in required format.
For pivoting I am using code from codeproject by Felipe
 /// <summary>
        /// Gets a Inverted DataTable
        /// </summary>
        /// <param name="table">Provided DataTable</param>
        /// <param name="columnX">X Axis Column</param>
        /// <param name="columnY">Y Axis Column</param>
        /// <param name="columnZ">Z Axis Column (values)</param>
        /// <param name="columnsToIgnore">Whether to ignore some column, it must be
        /// provided here</param>
        /// <param name="nullValue">null Values to be filled</param>
        /// <returns>C# Pivot Table Method  - Felipe Sabino</returns>
        public static DataTable GetInversedDataTable(DataTable table, string columnX,
             string columnY, string columnZ, string nullValue, bool sumValues)
        {
            //Create a DataTable to Return
            DataTable returnTable = new DataTable();

            if (columnX == "")
                columnX = table.Columns[0].ColumnName;

            //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)
                            {
                                //If Sum of Values is True it try to perform a Sum
                                //If sum is not possible due to value types, the value
                                // displayed is the last one read
                                if (sumValues)
                                {
                                    try
                                    {
                                        drReturn[rowColumnTitle] =
                                             Convert.ToDecimal(drReturn[rowColumnTitle]) +
                                             Convert.ToDecimal(dr[columnZ]);
                                    }
                                    catch
                                    {
                                        drReturn[rowColumnTitle] = dr[columnZ];
                                    }
                                }
                                else
                                {
                                    drReturn[rowColumnTitle] = dr[columnZ];
                                }

                            }
                        }
                    }

                    returnTable.Rows.Add(drReturn);
                }

            }
            else
            {
                throw new Exception("The columns to perform inversion are not provided");
            }

            //if a nullValue is provided, fill the datable with it
            if (nullValue != "")
            {
                foreach (DataRow dr in returnTable.Rows)
                {
                    foreach (DataColumn dc in returnTable.Columns)
                    {
                        if (dr[dc.ColumnName].ToString() == "")
                            dr[dc.ColumnName] = nullValue;
                    }
                }
            }

            return returnTable;
        }


Now I want to display sum horizontally and vertically of each row.
I am not using Gridview so that is not an option.
I need to calculate that in the datatable only.
How can I do this?Your help is really appreciated.Thanks.
grid.JPG
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I guess you will have to do coding for that as no out of the box option exists.
For each column, you can use the compute function to get value and for each row, you will have to loop through columsn and add values.
For compute do like: myDataTable.Compute( "sum(col1)", ""))   where 'col1' is a column name
I hope you got the picture clear.

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