Develop Reference

Break datatable into multiple tables by columns not rows

I have a datatable having columns like below
I want to break datatable into multiple datatables by splitting columns with every group of 4 columns like below
I can do it by simply by using loops and some calculations but wanted to get a better way if someone have.

DataTable has a copy method, you could use that, and remove the columns you don't need.
https://msdn.microsoft.com/en-us/library/system.data.datatable.copy(v=vs.110).aspx
System.Data.DataTable tbl = new System.Data.DataTable();
// Add Dummy Columns
for (int i = 0; i <= 11; i++)
{
tbl.Columns.Add(i.ToString());
}
// Assume We Have Data
// Split Table Into Lists of Tables
List <System.Data.DataTable> tables = new List<System.Data.DataTable>();
for ( int i = 0; i <= 2; i++)
{
int firstColumn = i * 4;
int lastColumn = i * 4 + 3;
System.Data.DataTable tblCopy = tbl.Copy();
for ( int j = 0; j < tbl.Columns.Count; j++)
{
if (j < firstColumn || j > lastColumn)
tblCopy.Columns.Remove(tbl.Columns[j].ColumnName);
}
tables.Add(tblCopy);
}

How to merge first 3 columns for rows with same value in PDF

I'm using itextSharp to export a DataTable to a pdf table. I can export the data to a pdf table using the sample code i have posted below. The DataTable contains close to 21 columns.
The first column in the pdf (DataTable) might contain similar values for any number of rows. If the data values in first column for a group of rows is similar, i want to merge the first 3 columns of those rows as one cell.
I'm having trouble modifying the code below to achieve this.
public iTextSharp.text.Table GetItextTable(DataTable dtChartData, string reportType)
{
int intCols = dtChartData.Columns.Count; //Total number of columns
int intRows = dtChartData.Rows.Count; //Total number of rows
iTextSharp.text.Table pdfTable = new iTextSharp.text.Table(intCols, intRows);
try
{
pdfTable.BorderWidth = 1;
pdfTable.Width = 100;
pdfTable.Padding = 1;
pdfTable.Spacing = 1;
/*creating table headers */
for (int i = 0; i < intCols; i++)
{
iTextSharp.text.Cell cellCols = new iTextSharp.text.Cell();
iTextSharp.text.Font ColFont = iTextSharp.text.FontFactory.GetFont("Tahoma", 07,
iTextSharp.text.Font.BOLD);
for (int l = 0; l < dtChartData.Columns.Count; l++)
{
if (dtChartData.Columns[l].ColumnName.Contains("_"))
{
dtChartData.Columns[l].ColumnName = dtChartData.Columns[l].ColumnName.Replace("_", " ");
}
}
iTextSharp.text.Chunk chunkCols = new iTextSharp.text.Chunk(dtChartData.Columns[i].ColumnName,ColFont);
cellCols.HorizontalAlignment = iTextSharp.text.Element.ALIGN_CENTER;
if ((chunkCols.ToString().ToLower() == "ReportDetails"))
{
cellCols.HorizontalAlignment = iTextSharp.text.Element.ALIGN_CENTER;
}
}
/* loop that take values from every row in datatable and insert in itextsharp table */
for (int k = 0; k < intRows; k++)
{
for (int j = 0; j < intCols; j++)
{
iTextSharp.text.Cell cellRows = new iTextSharp.text.Cell();
iTextSharp.text.Font RowFont = iTextSharp.text.FontFactory.GetFont("Tahoma", 07);
iTextSharp.text.Chunk chunkRows = new iTextSharp.text.Chunk(dtChartData.Rows[k][j].ToString(),RowFont);
cellRows.HorizontalAlignment = iTextSharp.text.Element.ALIGN_CENTER;
cellRows.Add(chunkRows);
pdfTable.AddCell(cellRows);
}
}
}
catch (Exception ex)
{
//error handling code here removed
}
return pdfTable;
}

Have you tried to change the Colspan?
iTextSharp.text.Cell cell = new iTextSharp.text.Cell();
cell.AddElement(new Paragraph("colspan 3"));
cell.Colspan = 3;
table.AddCell(cell);
In this case, cell will span three columns.

try this. i just edited your code, not checked
here i have edited 1 line of your code and added a new line (total 2 lines of change only).
dont forget to combine headding row like this, if you need
/* loop that take values from every row in datatable and insert in itextsharp table */
for (int k = 0; k < intRows; k++)
{
for (int j = 2; j < intCols; j++)// EDIT: if all first 3 cols are same, then starts with 2
{
iTextSharp.text.Cell cellRows = new iTextSharp.text.Cell();
if(j == 2) cellRows.Colspan = 3;// ADD: it'll gives a 3 times long cell
iTextSharp.text.Font RowFont = iTextSharp.text.FontFactory.GetFont("Tahoma", 07);
iTextSharp.text.Chunk chunkRows = new iTextSharp.text.Chunk(dtChartData.Rows[k][j].ToString(),RowFont);
cellRows.HorizontalAlignment = iTextSharp.text.Element.ALIGN_CENTER;
cellRows.Add(chunkRows);
pdfTable.AddCell(cellRows);
}
}

Show datasource rows as columns on a DataGridView (Winforms)

I wanna show all my DataSource rows on a DataGridView, but not as rows but as columns of a row. Each 12 items retrieved, I wanna insert a new row on the DataGridView and populate this new row with more items from the DataSource (12 at each row).
My DataSource retrieves just one item each, and using it directly with the DataGridView is working nicely, but shown a different row for each item.
Any hints?

Thanks to #SriramSakthivel.
private void AddToList(DataTable dt)
{
possibleWords = 0;
// Cleans the data grid view
WordList.DataSource = null;
WordList.Refresh();
// Let's transform the original data table onto another, changing rows by columns
DataTable table = new DataTable();
for (int i = 0; i < 10; i++)
{
table.Columns.Add(Convert.ToString(i));
}
DataRow r;
int col = 0;
//for (int k = 0; k < dt.Columns.Count; k++)
{
r = table.NewRow();
for (int j = 0; j < dt.Rows.Count; j++)
{
if (col >= 10)
{
table.Rows.Add(r);
col = 0;
r = table.NewRow();
}
r[col++] = (dt.Rows[j][0]).ToString().ToUpper();
possibleWords++;
}
table.Rows.Add(r);
}
// Puts the new data table as datasource of the word list
DataView dv = table.DefaultView;
WordList.DataSource = dv;
if (possibleWords == 0)
return;
WordList.Columns[0].DefaultCellStyle.BackColor = Color.WhiteSmoke;
WordList.ColumnHeadersVisible = false;
WordList.RowHeadersVisible = false;
}

Transposing columns in GridView

I have a data table that contains the data like below.
I want to display it in my Grid View like Following. It is actually the transpose of above table and one additional Row added for Viewing Product Details that will be a link button.
Can you please help me how can I achieve the following requirement in ASP.net using C#.
Many Thanks,
Awais Afzal.

Assuming that you table is a DataTable, you could use such an extension to reorder it:
public static DataTable Pivot(this DataTable tbl)
{
var tblPivot = new DataTable();
tblPivot.Columns.Add(tbl.Columns[0].ColumnName);
for (int i = 1; i < tbl.Rows.Count; i++)
{
tblPivot.Columns.Add(Convert.ToString(i));
}
for (int col = 0; col < tbl.Columns.Count; col++)
{
var r = tblPivot.NewRow();
r[0] = tbl.Columns[col].ToString();
for (int j = 1; j < tbl.Rows.Count; j++)
r[j] = tbl.Rows[j][col];
tblPivot.Rows.Add(r);
}
return tblPivot;
}
and set it as new DataSource:
dataGridView1.DataSource = oldDataTable.Pivot();

How to write a text file from a .NET DataGridView control cell values?

I have the following code that should loop through all the rows in my DataGridView, and write all their cell values to a text file.
However, it outputs all the rows, but only the first cell of each one, and not the other three cells.
string file_name = "C:\\test1.txt";
var objWriter = new System.IO.StreamWriter(file_name);
int count = dgv.Rows.Count;
for (int row = 0; row < count; row++)
{
objWriter.WriteLine(dgv.Rows[row].Cells[0].Value.ToString());
}
objWriter.Close();

for (int row = 0; row < count; row++)
{
int colCount = dgv.Rows[row].Cells.Count;
for ( int col = 0; col < colCount; col++)
{
objWriter.WriteLine(dgv.Rows[row].Cells[col].Value.ToString());
}
// record seperator could be written here.
}
Although, it would be cleaner if you used a foreach loop.

TextWriter sw = new StreamWriter(#"D:\\file11.txt");
int rowcount = dataGridViewX1.Rows.Count;
for (int i = 0; i < rowcount - 1; i++)
{
sw.WriteLine(dataGridViewX1.Rows[i].Cells[0].Value.ToString());
}
sw.Close();
MessageBox.Show("Text file was created." );