IsDBNull(Int32) Method

In This Topic

Gets a value indicating whether the column contains non-existent or missing values.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Overrides Function IsDBNull( _
   ByVal i As Integer _
) As Boolean

public override bool IsDBNull( 
   int i
)

Parameters

i

Return Value

true if the specified column value is equivalent to System.DBNull; otherwise, false.

Remarks

To avoid raising an error, call this method to check for null column values before calling the typed Get methods (for example, GetByte, GetChar, and so on).

Example

csharp

static void GetMyValue(SqlConnection myConnection)
{
  SqlCommand cmd = new SqlCommand("SELECT * FROM Test.AllTypes");
  cmd.Connection = myConnection;
  myConnection.Open();
  try
  {
    SqlDataReader reader = cmd.ExecuteReader();
    reader.Read();

    for (short i = 0; i < reader.FieldCount; i++)
    {
      if (reader.IsDBNull(i))
        Console.WriteLine("NULL");
      else
      {
        object someValue = reader.GetValue(i);
        Console.WriteLine(someValue.ToString());
      }
    }

    reader.Close();
  }
  finally
  {
    myConnection.Close();
  }
}

Visual Basic

Shared Sub GetMyValue(ByVal myConnection As SqlConnection)
  Dim cmd As New SqlCommand("SELECT * FROM Test.AllTypes")
  cmd.Connection = myConnection
  myConnection.Open()
  Try
    Dim reader As SqlDataReader = cmd.ExecuteReader
    reader.Read()
    For i As Short = 0 To reader.FieldCount - 1
      If reader.IsDBNull(i) Then
        Console.WriteLine("NULL")
      Else
        Console.WriteLine(reader.GetValue(i).ToString)
      End If
    Next i
    reader.Close()
  Finally
    myConnection.Close()
  End Try
End Sub

Reference

SqlDataReader Class
SqlDataReader Members
Overload List

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