Dealing with Empty cells from Excel export - asp.net

Question

I have an export function in my asp.net application. I want to remove all the white spaces/nulls in the list. Any way to trim it?
This is how my code looks like:
My GetData methode from the Database:
public void GetData()
{
try
{
DataTable dt = new DataTable();
SqlConnection connection = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["GS1connectionString"].ConnectionString);
connection.Open();
using (SqlCommand sqlCmd = new SqlCommand("DAtabase.dbo.SP_EXPORT", connection)) //Extract data: no cons first and cons after
{
sqlCmd.CommandType = CommandType.StoredProcedure;
using (SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd))
{
sqlDa.Fill(dt);
if (dt.Rows.Count > 0)
{
Session["TaskTable"] = dt;
}
}
}
}
catch (Exception)
{
Page.ClientScript.RegisterStartupScript(GetType(), "msgbox", "alert('No data found, try again');", true);
}
}
Clean dataTable methode:
public DataTable removeEmptyColumns(DataTable table)
{
int k = 0, l = 0;
DataTable dtResult = table.Clone();
DataRow row = dtResult.NewRow();
row = dtResult.NewRow();
for (k = 0; k < table.Rows.Count; k++)
{
for (l = 0; l < table.Rows.Count; l++)
{
if (k == l)
row[k] = table.Rows[k][l];
}
}
dtResult.Rows.Add(row);
dtResult.AcceptChanges();
return dtResult;
}
The Export to excel button:
protected void Button_Export_DS_Click(object sender, EventArgs e)
{
GetData();
DataTable dat = new DataTable();
DataTable dtNew = new DataTable();
dat = (DataTable)Session["TaskTable"];
dtNew = removeEmptyColumns(dat);
//Export to excel from datatable stored in a session
if (dtNew.Rows.Count > 0)
{
MemoryStream ms = new MemoryStream();
int i = 1;
using (ExcelPackage package = new ExcelPackage(ms))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Sheet" + i++);
worksheet.Cells["A1"].LoadFromDataTable(dtNew, true);
worksheet.Cells.AutoFitColumns();
Response.Clear();
package.SaveAs(Response.OutputStream);
Response.AddHeader("content-disposition", "attachchment; filename=DS_Export.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.xls";
Response.End();
}
}
}
I have an export function in my asp.net application. I want to remove all the white spaces/nulls in the list. Any way to trim it?

Answer 1

You copy and paste this function:
public DataTable removeEmptyColumns(DataTable table)
{
int k = 0, l = 0;
DataTable dtResult = table.Clone();
DataRow row = dtResult.NewRow();
row = dtResult.NewRow();
for (k = 0; k < table.Rows.Count ; k++)
{
for (l = 0; l < table.Rows.Count; l++)
{
if (k == l)
row[k] = table.Rows[k][l];
}
}
dtResult.Rows.Add(row);
dtResult.AcceptChanges();
return dtResult;
}
And then use the function like this:
DataTable dt = new DataTable();
DataTable dtNew = new DataTable();
dt = (DataTable)Session["TaskTable"];
dtNew = removeEmptyColumns(dt);
After that, use this dtNew in this:
if (dtNew.Rows.Count > 0)
{
MemoryStream ms = new MemoryStream();
int i = 1;
using (ExcelPackage package = new ExcelPackage(ms))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Sheet" + i++);
worksheet.Cells["A1"].LoadFromDataTable(dtNew, true);
worksheet.Cells.AutoFitColumns();
Response.Clear();
package.SaveAs(Response.OutputStream);
Response.AddHeader("content-disposition", "attachchment; filename=Export.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.xls";
Response.End();
}
}