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7.6

how to slove :dbNull" error in asp.net

Asked by ISKPatel in Programming for ASP.NET

Tags: dbnull, error

Dear,
i use Sql server as a databse
the following code for fill date dropdown for database field Date
this field have "datetime" data type
mostly this field bidefault "<Null>" in data base
i got error when me controlar read null values in this table
how i slove this error & fill a combo with out any error when any row hat null date.
-----------code--------------------
Sub fill_date()
        Dim tmp1, tmp2 As String
        Dim reader As SqlDataReader
        ssql = "Select Convert(char(12),Date,106)as Date from Attendance"
        Dim obj_cmd As New SqlCommand(ssql, db_con)
        reader = obj_cmd.ExecuteReader
        'tmp2 = reader.GetValue(0)
        While reader.Read
            tmp1 = reader.GetValue(0)
            If tmp1 <> tmp2 Then
                cmb_date.Items.Add(tmp1)
                cmb_WSdate.Items.Add(tmp1)
                cmb_WEdate.Items.Add(tmp1)
            End If
            tmp2 = reader.GetValue(0)
            '     cmb_date.DataValueField = "Date"
            '     cmb_date.DataTextField = "Date"
        End While
        ' cmb_date.DataSource = reader
        ' cmb_date.DataBind()

        reader.Close()
        obj_cmd.Dispose()

    End Sub
------------------------------
Thanks
[+][-]09/27/04 11:14 PM, ID: 12166874Accepted Solution

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About this solution

Zone: Programming for ASP.NET
Tags: dbnull, error
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Solution Provided By: ahmedrashid
Participating Experts: 2
Solution Grade: A
 
[+][-]09/27/04 11:17 PM, ID: 12166886Expert Comment

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[+][-]09/27/04 11:30 PM, ID: 12166949Author Comment

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