Solved

Invalid cast from DateTime to Single.

Posted on 2004-10-20
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865 Views
Last Modified: 2012-08-13
Hi im having a problem using asp.net web matrix

trying to bind results to a web grid.

gives me the error on the topic

Code i have is as follows:

Sub Page_Load(o as object, e as EventArgs)
  Dim reader As IDataReader = GetReader()

  Dim chart As New SmoothLineChart()
  chart.DataXValueField = "profit"
  chart.DataYValueField = "date"
  chart.DataSource = reader
  chart.DataBind()
  reader.Close()

  ChartControl1.Charts.Add(chart)
  ChartControl1.RedrawChart()
End Sub

Function GetReader() As IDataReader
  Dim connection As new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\PATH TO DB")
  Dim command As new OleDbCommand("SELECT *from DB where a.camp_id = 'INACT01'", connection)
  connection.Open()
  Return command.ExecuteReader(CommandBehavior.CloseConnection)
End Function


im getting the error on the following Line 14

Exception Details: System.InvalidCastException: Invalid cast from DateTime to Single.

Source Error:


Line 12:       chart.DataYValueField = "date"
Line 13:       chart.DataSource = reader
Line 14:       chart.DataBind()
Line 15:       reader.Close()
Line 16:    
 
Anyone can help me?

Thx in advance
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Question by:ridi786
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5 Comments
 
LVL 20

Expert Comment

by:jitganguly
ID: 12357975
DataYValueField  is intger or single and you are trying to assign to a datetime field and thats why your gettign this error. Put a differenet value i.e. other than date on DataYValueField and see first.
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LVL 1

Author Comment

by:ridi786
ID: 12358145
but i wana see movement by month, so i need it there. any way to format it as date?
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LVL 20

Expert Comment

by:jitganguly
ID: 12358369
Is it possible to make DataYValueField  as date ? I ahev no idea abotu SmoothLineChart, where did you get it ?
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LVL 20

Accepted Solution

by:
jitganguly earned 500 total points
ID: 12358449
0
 
LVL 1

Author Comment

by:ridi786
ID: 12358758
Well i tried the Tutorial

That doesnt give me much info. I know about that and searched his site or tried to evn.

He just give me types to check @ this URL

ChartControl1.YValuesFormat = "{0:N}"
       
You can see all the formats in here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconstandardnumericformatstrings.asp 
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