Develop Reference

How to read .xltx (Excel template) in C#

I am using OleDB connection for importing .xltx and it is showing exception - "External table not in expected format"
System.Data.DataTable dtExcel = new System.Data.DataTable();
string filePath = #"C:\Template.xltx";
string xlConnStr = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + filePath + "';Extended Properties= 'Excel 12.0;HDR=Yes;IMEX=1;Format=xltx'";
System.Data.OleDb.OleDbConnection cxlConn = new OleDbConnection(xlConnStr);
string query = "Select * from [Sheet2$A3:C34]";
OleDbDataAdapter dtAdapter = new OleDbDataAdapter(query, cxlConn);
dtAdapter.Fill(dtExcel);
I am using Microsoft.Jet.OLEDB.12.0 and Extended Properties=Excel 12.0
Can anyone please help me?
If not Oledb, any other way to read .xltx into datatable?
dtExcel is datatable, the line at which exception thrown is dtAdapter.Fill(dtExcel);

How to read a password protected Excel worksheet with OLEDB

I have set a password on my excel sheet. To unlock the worksheet, I modified my OLEDB connection string, but it didn't work. I got an error that "the source contains no dataRows", which means that it couldn't read the data from the excel file.
Before it was fine. What might be my problem?
This is my code:
public DataTable getExcelData(string fileName, string sheetName, ComboBox[] User_ComboBox)
{
this.m_comboBox = User_ComboBox;
// connectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + fileName + "';Extended Properties= 'Excel 12.0 XML;HDR=No;IMEX=1'";
connectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Password=xyz;Extended Properties='Excel 8.0;HDR=YES'";
string errorMessage = "";
DataTable dt = new DataTable();
try
{
string query = "SELECT * FROM [" + sheetName + "]";
OleDbConnection con = new OleDbConnection(connectionString);
OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, con);
dataAdapter.Fill(dt);
}
catch (Exception exp)
{
// errorCode = ErrorDefinition.ERROR_OLEDBERROR;
errorMessage = exp.Message;
}
return dt;
}

Instead of using an OleDbConnection you might consider using an Excel reading library like EPPlus to read the excel file. EPPlus supports reading password protected excel files.
You would need to implement some code to build the actual DataTable, but that should be simple enough. Just google it if you need to.

excel sheet to dataset c#

i'm currently using oledb for getting excel data to dataset/datatable in c#. so far it works but i encountered a problem in getting excel sheets. i have this code in getting the data from excel to dataset
bool ret = false;
DataSet dset = new DataSet();
string strConn;
try
{
if (filePath.Substring(filePath.LastIndexOf('.')).ToLower() == ".xlsx")
{
strConn = String.Format(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0;HDR=NO;IMEX=1;""", filePath);
}
else
strConn = #"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=NO;'";
//SELECT * FROM [{0}$A5:BE] dont accept all sheet names
string sql = String.Format("SELECT * FROM [{0}$A6:BH]", sheetname);
OleDbDataAdapter adap = new OleDbDataAdapter(sql, strConn);
adap.Fill(dset, "SignalList");
my problem is this select statement where i get the excel data. sometimes it accept this select statement:
String.Format("SELECT * FROM [{0}$A6:BH]", sheetname),
and sometimes it accepts this statement:
String.Format("SELECT * FROM [{0} $A6:BH]", sheetname)
Am i doing something wrong on getting data on excel? sorry for my english. please help

Import data from excel to mysql using c#

I have Excel file shown bellow
I want to read 1st read only all school names & school address & insert them in SchoolInfo table of mySql database.
After that I want to read data for each school & insert it in StudentsInfo table which has foreign key associated with SchoolInfo table.
I am reading excel sheet something like this.
public static void Import(string fileName)
{
string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName +
";Extended Properties=\"Excel 12.0;HDR=No;IMEX=1\"";
var output = new DataSet();
using (var conn = new OleDbConnection(strConn))
{
conn.Open();
var dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
if (dt != null)
foreach (DataRow row in dt.Rows)
{
string sheet = row["TABLE_NAME"].ToString();
var cmd = new OleDbCommand("SELECT * FROM [+"+sheet+"+]", conn);
cmd.CommandType = CommandType.Text;
OleDbDataAdapter xlAdapter = new OleDbDataAdapter(cmd);
xlAdapter.Fill(output,"School");
}
}
}
Now I am having data in datatable of dataset, Now how do I read desired data & insert it in my sql table.

Try the following steps:
Reading from Excel sheet
First you must create an OleDB connection to the Excel file.
String connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=" + path + ";" +
"Extended Properties=Excel 8.0;";
OleDbConnection xlConn = new OleDbConnection(connectionString);
xlConn.Open();
Here path refers to the location of your Excel spreadsheet. E.g. "D:\abc.xls"
Then you have to query your table. For this we must define names for the table and columns first. Click here to find out how.
Now create the command object.
OleDbCommand selectCmd = new OleDbCommand("SELECT * FROM [Sheet1$]", xlConn);
Now we have to store the ouput of the select command into a DataSet using a DataAdapter
OleDbDataAdapter xlAdapter = new OleDbDataAdapter();
objAdapter1.SelectCommand = selectCmd;
DataSet xlDataset = new DataSet();
xlAdapter.Fill(xlDataset, "XLData");
Save the data into variables
Now extract cell data into variables iteratively for the whole table by using
variable = xlDataset.Tables[0].Rows[row_value][column_value].ToString() ;
Write the data from the variables into the MySQL database
Now connect to the MySQL database using an ODBC connection
String mySqlConnectionString = "driver={MySQL ODBC 5.1 Driver};" +
"server=localhost;" + "database=;" + "user=;" + "password=;";
OdbcConnection mySqlConn = new OdbcConnection(mySqlConnectionString);
mySqlConn.Open();
Construct your INSERT statement using the variables in which data has been stored from the Excel sheet.
OdbcCommand mySqlInsert = new OdbcCommand(insertCommand, mySqlConn);
mySqlInsert.ExecuteScalar()

Read alphanumeric characters from csv file in C#

I am using the following code to read my csv file:
public DataTable ParseCSV(string path)
{
if (!File.Exists(path))
return null;
string full = Path.GetFullPath(path);
string file = Path.GetFileName(full);
string dir = Path.GetDirectoryName(full);
//create the "database" connection string
string connString = "Provider=Microsoft.ACE.OLEDB.12.0;"
+ "Data Source=\"" + dir + "\\\";"
+ "Extended Properties=\"text;HDR=Yes;FMT=Delimited\"";
//create the database query
string query = "SELECT * FROM " + file;
//create a DataTable to hold the query results
DataTable dTable = new DataTable();
//create an OleDbDataAdapter to execute the query
OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);
//fill the DataTable
dAdapter.Fill(dTable);
dAdapter.Dispose();
return dTable;
}
But the above doesn't reads the alphanumeric value from the csv file. it reads only i either numeric or alpha.
Whats the fix i need to make to read the alphanumeric values? Please suggest.

I suggest you use A Fast CSV Reader which does not have this issue and is much more faster.

Remove IMEX=1 from the connection string. I don't think you need it for CSV files.

Try this OleDBAdapter Excel QA I posted via stack overflow.
I have not tried this out, but it sounds interesting! LinqToExcel
they say it can be used on .CSV files as well...

hi all this code is gets alphanumeric values also
using System.Data.OleDb;
string ConnectionString = #"Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filepath + ";" + "Extended Properties="+(char)34+"Excel 8.0;IMEX=1;"+(char)34;
string CommandText = "select * from [Sheet1$]";
OleDbConnection myConnection = new OleDbConnection(ConnectionString);
myConnection.Open();
OleDbDataAdapter myAdapter = new OleDbDataAdapter(CommandText, myConnection);
ds = null;
ds = new DataSet();
myAdapter.Fill(ds);