CODEWITHSUNDEEP
asp.netvb.netparameterized
Aditya Pratap Singh
Aditya Pratap Singh

Reputation: 108

The SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim ds As DataSet = New DataSet()
    Dim param As SqlParameter = New SqlParameter("@user_code", SqlDbType.Char, 4)
    param.Value = "0016"
    Const sqlstr As String = "select sectors.sector_code,sector_name   from user_sectors inner join sectors on user_sectors.sector_code = sectors.sector_code  where user_code = @user_code  and sectors.sector_code not in ('z')"
    Dim da As SqlDataAdapter = New SqlDataAdapter(sqlstr, _con)
    da.SelectCommand.Parameters.Add("@user_code")
    da.Fill(ds)
    ddl.DataValueField = "sector_code"
    ddl.DataTextField = "sector_name"
    ddl.DataSource = ds.Tables(0)
    ddl.DataBind()    
End Sub

Upvotes: 2

Views: 4007

Answers (3)

Jodrell
Jodrell

Reputation: 35706

Thats because its a SqlParameterCollection and not a string collection.

If you call the appropriate Add overload it will however make the instance for you, if given enough information.

Like this perhaps,

Dim newParam = da.SelectCommand.Parameters.Add("@user_code", sqlDbType.Char, 4)
newParam.Value = "0016"

or, replace several lines like this

da.SelectCommand.Parameters.Add( _
    New SqlParameter("@user_code", SqlDbType.Char, 4) With { .Value = "0016" }))

or, if you want to use many lines, just add

da.SelectCommand.Parameters.Add(param)

Upvotes: 1

John Woo
John Woo

Reputation: 263693

You should pass param in add

da.SelectCommand.Parameters.Add(param)

Upvotes: 1

jbl
jbl

Reputation: 15413

I guess line

da.SelectCommand.Parameters.Add("@user_code")

should be

da.SelectCommand.Parameters.Add(param)

Upvotes: 2

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