我有一个问题与我的搜索我尝试使用2个参数进行搜索，但它使平均误差说:过程或函数'Learner_Existance"预计参数'@ AccessionNo"，这是不提供

这里是我的商店PROC ...
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说到这里，我的业务层

{C} .................................................. ....................................
和我的客户端

Protected Sub btnsearch_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnsearch.Click

 

        Dim objL As New Learner

        Dim objlist As New List(Of Learner)

        Dim code As String

        Dim accesion As String

 

        Try

            objlist = objL.Get_Learner(txtEmiscode.Text, txtAccession.Text)

            For Each ll As Learner In objlist

                If objlist.Count <> 0 Then

 

                    code = ll.EmisCode

                    accesion = ll.AccessionNo

                    Response.Redirect(" /Emis_LearnerView.aspx" & "?EmisCode=" & code & "?AccessionNo=" & accesion)

                Else

                    lblerror.Text = "cannot find student"

                End If

            Next

 

        Catch ex As Exception

            lblerror.Text = ex.Message

 

        End Try

 

    End Sub

End Class

请帮助我的家伙，现在差不多一个星期