ASP.Net error NpgsqlCommand AddWithValue is not member of Npgsql.ParameterCollection
Public Class GraphData
Public Property label As String
Public Property value As Integer
End Class
<WebMethod()>
Public Shared Function GetGraphData(ByVal customerId As String) As List(Of GraphData)
Dim graphDataList As List(Of GraphData) = New List(Of GraphData)()
Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
Dim con As NpgsqlConnection = New NpgsqlConnection(constr)
Dim cmd As NpgsqlCommand = New NpgsqlCommand("SELECT TOP 10 CAST(OrderDate AS DATE) OrderDate, SUM(Freight) Freight FROM Orders GROUP BY Orderdate")
cmd.Parameters.AddWithValue("@Id", If(Not String.IsNullOrEmpty(customerId), customerId, CObj(DBNull.Value)))
cmd.Connection = con
con.Open()
Dim sdr As NpgsqlDataReader = cmd.ExecuteReader()
While sdr.Read()
graphDataList.Add(New GraphData() With {
.label = Convert.ToString(sdr("OrderDate")),
.value = (Convert.ToInt32(sdr("Freight")))
})
End While
con.Close()
Return graphDataList
End Function
Aspx code:-
<link type="text/css" rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.css">
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$.ajax({
type: 'POST',
url: "Chart_test.aspx/GetGraphData",
dataType: 'json',
contentType: "application/json; charset=utf-8",
data: {},
success: function (result) {
new Morris.Donut({
element: 'line-chart',
data: result.d,
xkey: 'label',
ykeys: ['value'],
labels: ['value']
});
},
error: function (error) {
alert(error.responseText);
}
});
});
</script>
<div id="line-chart">
</div>
