DateTime null in Sql Server database

Hi,

I'm using this source code in order to set the DateTime field of my Sql Server database to null.
I am retreiving dates from an excel sheet. If no date is found, then I set my variable myDate to DateTime.MinValue then i test it just before feeding my database.

I have an error saying that 'object' does not contain definition for 'Value'.

In french :Message d'erreur du compilateur:CS0117: 'object' ne contient pas de définition pour 'Value'
dbCommand.Parameters["@.DateRDV"].Value = System.Data.SqlTypes.SqlDateTime.Null;

The funny thing is that in the class browser i can see the Value property for the class Object...

C#, asp.net
string sqlStmt ;
string conString ;
SqlConnection cn =null;
SqlCommand cmd =null;
SqlDateTime sqldatenull ;
try
{
sqlStmt = "insert into Emp (Date) Values (@.Date) ";
conString = "server=localhost;database=Northwind;uid=sa;pwd=;";
cn = new SqlConnection(conString);
cmd = new SqlCommand(sqlStmt, cn);
cmd.Parameters.Add(new SqlParameter("@.Date", SqlDbType.DateTime));
sqldatenull = System.Data.SqlTypes.SqlDateTime.Null;
if (myDate == DateTime.MinValue)
{
cmd.Parameters ["@.Date"].Value =sqldatenull ;
}
else
{
cmd.Parameters["@.Date"].Value = myDate;
}
cn.Open();
cmd.ExecuteNonQuery();
Label1.Text = "Record Inserted Succesfully";
}
catch (Exception ex)
{
Label1.Text = ex.Message;
}
finally
{
cn.Close();
}

Are you sure you're referencing the correct Parameter? The error message says "@.DataRDV" but your code uses "@.Date".

|||

GranPas wrote:

Hi,

I'm using this source code in order to set the DateTime field of my Sql Server database to null.
I am retreiving dates from an excel sheet. If no date is found, then I set my variable myDate to DateTime.MinValue then i test it just before feeding my database.

I have an error saying that 'object' does not contain definition for 'Value'.

In french :Message d'erreur du compilateur:CS0117: 'object' ne contient pas de définition pour 'Value'
dbCommand.Parameters["@.DateRDV"].Value = System.Data.SqlTypes.SqlDateTime.Null;

The funny thing is that in the class browser i can see the Value property for the class Object...

C#, asp.net
string sqlStmt ;
string conString ;
SqlConnection cn =null;
SqlCommand cmd =null;
SqlDateTime sqldatenull ;
try
{
sqlStmt = "insert into Emp (Date) Values (@.Date) ";
conString = "server=localhost;database=Northwind;uid=sa;pwd=;";
cn = new SqlConnection(conString);
cmd = new SqlCommand(sqlStmt, cn);
cmd.Parameters.Add(new SqlParameter("@.Date", SqlDbType.DateTime));
sqldatenull = System.Data.SqlTypes.SqlDateTime.Null;
if (myDate == DateTime.MinValue)
{
cmd.Parameters ["@.Date"].Value =sqldatenull ;
}
else
{
cmd.Parameters["@.Date"].Value = myDate;
}
cn.Open();
cmd.ExecuteNonQuery();
Label1.Text = "Record Inserted Succesfully";
}
catch (Exception ex)
{
Label1.Text = ex.Message;
}
finally
{
cn.Close();
}

Did you add a parameter called "@.DateRDV"?

|||

Thanks for help. I actually changed my variable name which was DateRDV to Date because the source code i had pasted was from a sample i found on Internet.

I found a solution to my problem. When the user click on a button, I set myDate to DateTime.MinValue if myDate is null, as i did before. Now, I am using a function in order to insert the date in my database. This is working and I still don't know why the older source code did not. Here is my source working :

int Insert_Trdv(System.DateTime dateRDV)
{
string connectionString = "server=\'myServer\'; user id=\'myId\';
password=\'myPassword\'; database=\'myPassword\'";
System.Data.IDbConnection dbConnection = new System.Data.SqlClient.SqlConnection(connectionString);
string queryString = @."INSERT INTO [Trdv] ([DateRDV])";
System.Data.IDbCommand dbCommand = new System.Data.SqlClient.SqlCommand();
dbCommand.CommandText = queryString;
dbCommand.Connection = dbConnection;
System.Data.IDataParameter dbParam_dateRDV = new
System.Data.SqlClient.SqlParameter();
dbParam_dateRDV.ParameterName = "@.DateRDV";
if(dateRDV == DateTime.MinValue)
{
dbParam_dateRDV.Value = DBNull.Value;
}
else
{
dbParam_dateRDV.Value = dateRDV;
}
dbParam_dateRDV.DbType = System.Data.DbType.DateTime;
dbCommand.Parameters.Add(dbParam_dateRDV);
int rowsAffected = 0;
dbConnection.Open();
try
{
rowsAffected = dbCommand.ExecuteNonQuery();
}
finally
{
dbConnection.Close();
}
return rowsAffected;
}

Thx