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hebrew from the Connection

I am trying with oracle database to Insert and select Hebrew letters
and it not working well.
I tried
Insert into mytable values ('היי');
and the result is ??? and not היי
can someone help me with that
Edit:
Now after i ask from DBA for hebrew option i can write in Hebrew from the sqlplus
but now from my project it still write ???
my code is
OleDbConnection conn = Connect();
conn.Open();
OleDbCommand com = new OleDbCommand("Insert into mytable values ('היי')", conn);
com.ExecuteNonQuery();
and still the result is ???

I can't really test this because I don't know anything about your database (not even your column names), but you should do that command with parameters:
var testString = "היי"; // Do be aware that Visual Studio displays Hebrew text right-to-left, so the actual string is reversed from what you see.
using (OleDbConnection conn = Connect())
{
conn.Open();
using (OleDbCommand com = conn.CreateCommand())
{
// OleDbCommand com = new OleDbCommand("Insert into mytable values ('היי')", conn);
com.CommandText = "Insert into mytable values (?)";
com.Parameters.Add(new OleDbParameter { OleDbType = OleDbType.VarWChar }).Value = testString;
com.ExecuteNonQuery();
}
}
Also, don't forget to dispose your disposables via a using statement.
Relatedly, here is a report that using a parameterized query fixed a similar problem with OracleCommand.

DataAdapter.UpdateCommand not working c#?

I am using this code to update "SOME" columns in a table in my database. But everytime I try to do so an error is given.
No value given for one or more required parameters.
con.Open();
SlipDA = new OleDbDataAdapter();
string sqlUpdate = "Update tbl_Slip SET RaiseBasic=#RaiseBasic, OtherDed=#OtherDed, Arrears=#Arrears, Notes=#Notes WHERE SlipNo=#SlipNo";
SlipDA.UpdateCommand = new OleDbCommand(sqlUpdate, con);
SlipDA.UpdateCommand.Parameters.AddWithValue("#RaiseBasic", Convert.ToInt32(dRow[4].ToString()));
SlipDA.UpdateCommand.Parameters.AddWithValue("#OtherDed", Convert.ToInt32(dRow[5].ToString()));
SlipDA.UpdateCommand.Parameters.AddWithValue("#Arrears", Convert.ToInt32(dRow[7].ToString()));
SlipDA.UpdateCommand.Parameters.AddWithValue("#Notes", dRow[8].ToString());
SlipDA.UpdateCommand.Parameters.AddWithValue("#SlipNo", dRow[0].ToString());
SlipDA.UpdateCommand.ExecuteNonQuery();
con.Close();
The table contains 9 columns but I only want to update a few.

This Could be the problem :
The OLE DB .NET Provider does not support named parameters for passing
parameters to an SQL statement or a stored procedure called by an
OleDbCommand when CommandType is set to Text. In this case, the
question mark (?) placeholder must be used. For example: SELECT * FROM
Customers WHERE CustomerID = ?
source : this
so basically your query should be like this :
string sqlUpdate = "Update tbl_Slip SET RaiseBasic= ?, OtherDed= ?, Arrears= ?, Notes= ? WHERE SlipNo= ?";

try this
string sqlUpdate = "Update tbl_Slip SET RaiseBasic=#RaiseBasic, OtherDed=#OtherDed, Arrears=#Arrears, Notes=#Notes WHERE SlipNo=#SlipNo";
OleDbCommand UpdateCommand = new OleDbCommand(sqlUpdate, con);
UpdateCommand.Parameters.AddWithValue("#RaiseBasic", Convert.ToInt32(dRow[4].ToString()));
UpdateCommand.Parameters.AddWithValue("#OtherDed", Convert.ToInt32(dRow[5].ToString()));
UpdateCommand.Parameters.AddWithValue("#Arrears", Convert.ToInt32(dRow[7].ToString()));
UpdateCommand.Parameters.AddWithValue("#Notes", dRow[8].ToString());
UpdateCommand.Parameters.AddWithValue("#SlipNo", dRow[0].ToString());
con.Open();
UpdateCommand.ExecuteNonQuery();
con.Close();

how do i update data in access database using c# 2010

OleDbConnection vcon = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\SummerJob\DataBase.accdb");
string cmdtxt = "UPDATE Students SET S_Name = ?, S_Surname = ?, S_E-Mail = ? WHERE ID = ?";
OleDbCommand cmd = new OleDbCommand(cmdtxt, vcon);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("S_Name", EditName.Text);
cmd.Parameters.AddWithValue("S_Surname", editSurname.Text);
cmd.Parameters.AddWithValue("S_E-Mail", editMail.Text);
vcon.Open();
cmd.ExecuteNonQuery();
vcon.Close();
//i use this code but it says syntax error in update statement

Where is the last parameter ???
ID=?
Not sure, but I will bet that without that parameter your query doesn't look right to the parser.

You need to pass ID? via SqlParameter like this cmd.Parameters.AddWithValue("ID", Id.Text);
Also make sure that the parameters are added in the same order they occur

Insert query for ms-access with Oledb object getting exception of not a valid query

I'm using the following code and it is giving the invalid Insert command exception.
row the DataRow object to be added to the database , conn is the OleDBConnection object.
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
cmd.CommandText = `"Insert Into Appointments(ID,Body,End,Location,Start,Subject,Properties)"
+ "Values(#ID,#Body,#End,#Location,#Start,#Subject,#Properties)";
cmd.Parameters.Add("#ID", OleDbType.WChar).Value = row[0].ToString();
cmd.Parameters.Add("#Body", OleDbType.WChar).Value = row[1].ToString();
cmd.Parameters.Add("#End", OleDbType.Date).Value = Convert.ToDateTime(row[2]).Date.ToLongDateString();
cmd.Parameters.Add("#Location", OleDbType.WChar).Value = row[3].ToString();
cmd.Parameters.Add("#Start", OleDbType.Date).Value = Convert.ToDateTime(row[4]).Date.ToLongDateString();
cmd.Parameters.Add("#Subject", OleDbType.WChar).Value = row[5].ToString();
cmd.Parameters.Add("#Properties", OleDbType.WChar).Value = row[6].ToString();
conn.Open();
cmd.ExecuteNonQuery(); //At this line exception is generating
conn.Close();
Please help me in this.

You've got one (possibly more) reserved word in your table's field names.
The field name End ... at the very least.
Try
cmd.CommandText = `"Insert Into Appointments(ID,Body,[End],Location,Start,Subject,Properties)"
+ "Values(#ID,#Body,#End,#Location,#Start,#Subject,#Properties)";

Does "Appointments" table support inserting ID? If ID column is the identity value, that may cause problem.

I think that the data-types that you use for your parameters are incorrect.
If your ID column is a numeric column, you shouldn't use OleDbType.WChar, but OleDbType.Integer, for instance
For alfanumeric-columns, I wouldn't use OleDbType.WChar either, but OleDbtype.VarChar.
See the OleDbType enumeration as well.

Excel Jet OLE DB: Inserting a DateTime value

OLEDB can be used to read and write Excel sheets. Consider the following code example:
using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\my\\excel\\file.xls;Extended Properties='Excel 8.0;HDR=Yes'")) {
conn.Open();
OleDbCommand cmd = new OleDbCommand("CREATE TABLE [Sheet1] ([Column1] datetime)", conn);
cmd.ExecuteNonQuery();
cmd = new OleDbCommand("INSERT INTO Sheet1 VALUES (#mydate)", conn);
cmd.Parameters.AddWithValue("#mydate", DateTime.Now.Date);
cmd.ExecuteNonQuery();
}
This works perfectly fine. Inserting numbers, text, etc. also works well. However, inserting a value with a time component fails:
using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\my\\excel\\file.xls;Extended Properties='Excel 8.0;HDR=Yes'")) {
conn.Open();
OleDbCommand cmd = new OleDbCommand("CREATE TABLE [Sheet1] ([Column1] datetime)", conn);
cmd.ExecuteNonQuery();
cmd = new OleDbCommand("INSERT INTO Sheet1 VALUES (#mydate)", conn);
cmd.Parameters.AddWithValue("#mydate", DateTime.Now); // <-- note the difference here
cmd.ExecuteNonQuery();
}
Executing this INSERT fails with an OleDbException: Data type mismatch in criteria expression.
Is this a known bug? If yes, what can be done to workaround it? I've found one workaround that works:
cmd = new OleDbCommand(String.Format(#"INSERT INTO Sheet1 VALUES (#{0:dd\/MM\/yyyy HH:mm:ss}#)", DateTime.Now), conn);
It basically creates an SQL statement that looks like this: INSERT INTO Sheet1 VALUES (#05/29/2011 13:12:01#). Of course, I don't have to tell you how ugly this is. I'd much rather have a solution with a parameterized query.

It appears to be a known bug https://connect.microsoft.com/VisualStudio/feedback/details/94377/oledbparameter-with-dbtype-datetime-throws-data-type-mismatch-in-criteria-expression
You might want to truncate the milisecond like this it appear to work for OleDbParameter:
DateTime org = DateTime.UtcNow;
DateTime truncatedDateTime = new DateTime(org.Year, org.Month, org.Day, org.Hour, org.Minute, org.Second);
And add this instead of the DateTime.Now into your parameter value.

The problem is the cell containing datetime value cannot be directly put into excel' column. You have to either insert the date component or the time component. The reason for failure is the default property of excel' cell is "values" instead of "datetime" in excel.