DataReader Error if DB Column blank

[Guest]

Hi there.

I have various pages in an ASP.NET applicaiton and in the Page_load event I have data being read from a SQL DB filling textboxes on the page

Now, sometimes the fields in the DB will be blank and I would a 'Invalid attempt to read when no data is present.' error.

I have tried to implement validation in pages to ease this issue but I need a solution which covers just the below - reading a DB where it doesn't fail (I have received suggestions before, but never examples of code).

Code I have:

Dim cn As SqlConnection
Dim cmd As SqlCommand
Dim rdr As SqlDataReader
cn = New SqlConnection("xxx")
cmd = New SqlCommand("SELECT * FROM MemberTable WHERE Email=@Email", cn)
cmd.Parameters.Add("@Email", EmailVar)

cn.Open()
rdr = cmd.ExecuteReader()
rdr.Read()

txt1.Text = "" & rdr("FirstName")
txt2.Text = "" & rdr("LastName")
txt3.Text = "" & rdr("dateOfBirth")

rdr.Close()

Many thanks

 

[Cristian Suazo]

Hi,

try putting the read part in an if statement (it returns true if it's able
to read). Something like this:

If rdr.Read() = true Then
txt1.Text = "" & rdr("FirstName")
txt2.Text = "" & rdr("LastName")
txt3.Text = "" & rdr("dateOfBirth")
End If


Hope this helps
/Cristian

Hi there.

I have various pages in an ASP.NET applicaiton and in the Page_load event

I have data being read from a SQL DB filling textboxes on the page

Now, sometimes the fields in the DB will be blank and I would a 'Invalid

attempt to read when no data is present.' error.

I have tried to implement validation in pages to ease this issue but I

need a solution which covers just the below - reading a DB where it doesn't
fail (I have received suggestions before, but never examples of code).