hi,

why I still get result 255 columns as I have approximately 280 in my
test1.xlsx
here is the code used

string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data
Source=C:\test1.xlsx;Extended Properties=""Excel 12.0;HDR=YES;""";

string strSQL = "SELECT * FROM [test$]";
OleDbConnection excelConnection = new OleDbConnection
(connectionString);

OleDbCommand dbCommand = new OleDbCommand(strSQL,
excelConnection);
OleDbDataAdapter dataAdapter = new OleDbDataAdapter
(dbCommand);

System.Data.DataTable dTable = new System.Data.DataTable
();
dataAdapter.Fill(dTable);
Trace.WriteLine(dTable.Columns.Count.ToString
());

On Apr 28, 1:47*am, wrote:
hi,

why I still get result 255 columns as I have approximately 280 in my
test1.xlsx
here is the code used

string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data
Source=C:\test1.xlsx;Extended Properties=""Excel 12.0;HDR=YES;""";

* * * * * * string strSQL = "SELECT * FROM [test$]";
* * * * * * OleDbConnection excelConnection = new OleDbConnection
(connectionString);

* * * * * * OleDbCommand dbCommand = new OleDbCommand(strSQL,
excelConnection);
* * * * * * OleDbDataAdapter dataAdapter = new OleDbDataAdapter
(dbCommand);

* * * * * * System.Data.DataTable dTable = new System.Data.DataTable
();
* * * * * * dataAdapter.Fill(dTable);
* * * * * * Trace.WriteLine(dTable.Columns.Count.ToString
());


Maximum no. of columns that you can have is 256. What do you mean by
"approximately 280 in my test1.xlsx" ??

"dk" wrote:

On Apr 28, 1:47 am, wrote:
hi,

why I still get result 255 columns as I have approximately 280 in my
test1.xlsx
here is the code used

string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data
Source=C:\test1.xlsx;Extended Properties=""Excel 12.0;HDR=YES;""";

string strSQL = "SELECT * FROM [test$]";
OleDbConnection excelConnection = new OleDbConnection
(connectionString);

OleDbCommand dbCommand = new OleDbCommand(strSQL,
excelConnection);
OleDbDataAdapter dataAdapter = new OleDbDataAdapter
(dbCommand);

System.Data.DataTable dTable = new System.Data.DataTable
();
dataAdapter.Fill(dTable);
Trace.WriteLine(dTable.Columns.Count.ToString
());


Maximum no. of columns that you can have is 256. What do you mean by
"approximately 280 in my test1.xlsx" ??

max number of columns that excel 2007 supports is 16k
http://visio.mvps.org/Excel_2007.htm

so I have 280, and when read the sheet - the result is 255. My question is
why?

The total number of available columns in Excel 256 (2^8) 16k (2^14)
"dk" wrote:

On Apr 28, 1:47 am, wrote:
hi,

why I still get result 255 columns as I have approximately 280 in my
test1.xlsx
here is the code used

string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data
Source=C:\test1.xlsx;Extended Properties=""Excel 12.0;HDR=YES;""";

string strSQL = "SELECT * FROM [test$]";
OleDbConnection excelConnection = new OleDbConnection
(connectionString);

OleDbCommand dbCommand = new OleDbCommand(strSQL,
excelConnection);
OleDbDataAdapter dataAdapter = new OleDbDataAdapter
(dbCommand);

System.Data.DataTable dTable = new System.Data.DataTable
();
dataAdapter.Fill(dTable);
Trace.WriteLine(dTable.Columns.Count.ToString
());


Maximum no. of columns that you can have is 256. What do you mean by
"approximately 280 in my test1.xlsx" ??