[RESOLVED] Display data from database to a textbox

in a search page in my asp.net+vb web page.  iam using a code as under but when the field is balnk it gives error.

statustxt.Text = dt.Tables("PERS").Rows(0).Item("OutDetails")

Then i tried this code also 

If dt.Tables("PERS").Rows(0).Item("Courser") Is System.DBNull.Value <> True Then

statustxt.Text = dt.Tables("PERS").Rows(0).Item("OutDetails")

Else

statustxt.Text = ""

End If

but it also gives error as 

Conversion from type 'DBNull' to type 'String' is not valid.

If dt.Tables(0).Rows.Count > 0 Then

Dim outDetails = dt.Tables("PERS").Rows(0)("OutDetails")

If Not outDetails = DBNull.Value And Not outDetails Is Nothing Then

statustxt.Text = dt.Tables("PERS").Rows(0)("OutDetails").ToString()

End If

End If