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ERROR-Conversion from string "'," to type 'Double' is not valid

Posted By:      Posted Date: September 27, 2010    Points: 0   Category :ASP.Net
 

Hello,

I am having  badly stuck!!I have spent hours in trying to solve that.

I am having the following loving function:

 

   Public Function InsertDeleteUpdate(ByVal command As String) As Boolean
        Try
            open_connection()
            objectconnection.Open()
            cmd.Connection = objectconnection
            cmd.CommandText = command
            cmd.ExecuteNonQuery()
            objectconnection.Close()
            Return True
        Catch ex As Exception
            Return False
End Try


 In the above function I pass the following string:

gridcost = Convert.ToDecimal(txtcost.Text)
_date = Convert.ToDateTime(txtdatefrom.Text)
patient = Convert.ToInt32(ddlpatients.SelectedValue)


 sqlstring = "execute dbo.InsertDeleteUpdate " & patient & ",'" & _date + "'," & gridcost & ",'" & txtinsurances.Text & "','" & checkreceipt.Checked + "'," & appointment_xid
InsertDeleteUpdate(sqlstring)

The string includes a stored procedure.The store procedure includes the following parameters:
 

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declare @itemID varchar(20)
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set @itemID = ''
set
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