SqlCeDataReader.Read Method

Article
10/22/2007

Advances SqlCeDataReader to the next record.

Namespace: System.Data.SqlServerCe
Assembly: System.Data.SqlServerCe (in system.data.sqlserverce.dll)

Syntax

'Declaration
Public Overrides Function Read As Boolean
'Usage
Dim instance As SqlCeDataReader
Dim returnValue As Boolean

returnValue = instance.Read

public override bool Read ()

public:
virtual bool Read () override

public boolean Read ()

public override function Read () : boolean

Return Value

true if there are more rows; otherwise, false.

Remarks

The default position of the SqlCeDataReader is prior to the first record. To begin accessing any data, you must call Read.

While SqlCeDataReader is in use, the associated SqlCeConnection is busy serving it until you call Close.

Example

The following example creates a SqlCeConnection, a SqlCeCommand, and a SqlCeDataReader. The example reads through the data and writes it out to the console. Finally, the example closes the SqlCeDataReader, then the SqlCeConnection.

Dim conn As SqlCeConnection = Nothing
Dim cmd As SqlCeCommand = Nothing
Dim rdr As SqlCeDataReader = Nothing

Try
    ' Open the connection and create a SQL command
    '
    conn = New SqlCeConnection("Data Source = AdventureWorks.sdf")
    conn.Open()
    
    cmd = New SqlCeCommand("SELECT * FROM DimEmployee", conn)
    
    rdr = cmd.ExecuteReader()
    
    ' Iterate through the results
    '
    While rdr.Read()
        Dim employeeID As Integer = rdr.GetInt32(0) ' or: rdr["EmployeeKey"];
        Dim lastName As String = rdr.GetString(5) ' or: rdr["FirstName"];
    End While
    
    ' Always dispose data readers and commands as soon as practicable
    '
    rdr.Close()
    cmd.Dispose()
Finally
    ' Close the connection when no longer needed
    '
    conn.Close()
End Try

SqlCeConnection conn = null;
SqlCeCommand cmd = null;
SqlCeDataReader rdr = null;

try
{
    // Open the connection and create a SQL command
    //
    conn = new SqlCeConnection("Data Source = AdventureWorks.sdf");
    conn.Open();

    cmd = new SqlCeCommand("SELECT * FROM DimEmployee", conn);

    rdr = cmd.ExecuteReader();

    // Iterate through the results
    //
    while (rdr.Read())
    {
        int employeeID = rdr.GetInt32(0);   // or: rdr["EmployeeKey"];
        string lastName = rdr.GetString(5); // or: rdr["FirstName"];
    

    // Always dispose data readers and commands as soon as practicable
    //
    rdr.Close();
    cmd.Dispose();

finally
{
    // Close the connection when no longer needed
    //
    conn.Close();

.NET Framework Security

Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see .

Platforms

Windows CE, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows XP Professional x64 Edition, Windows XP SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

Version Information

.NET Compact Framework

Supported in: 2.0, 1.0

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