I want to download excel from outlook every month. The Excel format for this month is shown below.
I want to sum Jan and feb column data which is integer value and add the sum of those 2 values to Total value column.
but next time when i download excel from outlook my input file will be shown below
So now i need to sum mar,feb,jan column values and add sum value to Total value colums.
so every time when i download excel months will increase how to do sum
(From r In Enumerable.Range(0,dt_sampleData.RowCount)
Let total = Enumerable.Range(dt_sampleData.Columns("Company").Ordinal+1,dt_sampleData.ColumnCount-4).Sum(Function(c) Convert.ToDouble(dt_sampleData.Rows(r)(c))).ToString
Let ra = dt_sampleData.Rows(r).ItemArray.Take(dt_sampleData.ColumnCount-1).Append(total).ToArray()
Select dt_result.Rows.Add(ra)).CopyToDataTable()
(From r In Enumerable.Range(0,dt_sampleData.Rows.Count)
Let total = Enumerable.Range(dt_sampleData.Columns("Company").Ordinal+1,dt_sampleData.Columns.Count-4).
Sum(Function(c) If(Double.TryParse(dt_sampleData.Rows(r)(c).ToString,0),Double.Parse(dt_sampleData.Rows(r)(c).ToString),0)).ToString
Let ra = dt_sampleData.Rows(r).ItemArray.Take(dt_sampleData.Columns.Count-1).Append(total).ToArray()
Select dt_result.Rows.Add(ra)).CopyToDataTable()