Category: HOW TO

The data type image of Microsoft SQL Server is used to store
Variable-length binary data from 0 through 2^31-1 (2,147,483,647) bytes.

The following sample code show how to read text from data type Image using VB.NET:

[sourcecode language=”vb”]
Dim query As String = "SELECT [Image Column] FROM MyTable"
Dim conn As New SqlConnection(connString)
Dim cmd As New SqlCommand(query, conn)

conn.Open()
Dim rdr As SqlDataReader = cmd.ExecuteReader(CommandBehavior.SingleRow)

Try
If rdr.Read() Then
Dim i As Integer = rdr.GetOrdinal("Image Column")
If Not rdr.IsDBNull(i) Then
Dim bufferSize = rdr.GetBytes(i, 0, Nothing, 0, Integer.MaxValue) – 1
Dim outbyte(bufferSize) As Byte
rdr.GetBytes(i, 0, outbyte, 0, bufferSize)
Dim enc As New System.Text.ASCIIEncoding
MyTextBox.Text = enc.GetString(outbyte, 0, bufferSize)
End If
End If
Finally
‘ Always call Close when done reading
‘
rdr.Close()

‘ Always call Close when done reading
‘
conn.Close()
End Try
[/sourcecode]

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