This is my code in vb.net , when i pass the insert query to the SQL server from VB.net i got exception at query that object reference is not set to the instance object,
in sql fileds are allow null and ID is auto incrrament.
one of my companion said that use record set and tell the condition somthing like that but i have totally no idea about record set in New in VB.net,
please help me, what should i do,
Imports System.Data
Imports System.Data.SqlClient
Public Class MaintenanceTask
Dim cn As New System.Data.SqlClient.SqlConnection
Sub connect()
cn = New System.Data.SqlClient.SqlConnection("Data Source=localhost;Initial Catalog=Fleet Maintainance;Integrated Security=True")
End Sub
Sub lockall()
cBx1.Enabled = False
cBx2.Enabled = False
tBx1.Enabled = False
tBx2.Enabled = False
tBx3.Enabled = False
End Sub
Sub unlockall()
cBx1.Enabled = True
cBx2.Enabled = True
tBx1.Enabled = True
tBx2.Enabled = True
tBx3.Enabled = True
End Sub
Sub setall()
cBx1.Text = ""
cBx2.Text = ""
tBx1.Text = ""
tBx2.Text = ""
tBx3.Text = ""
End Sub
Sub updatecombo1()
Call connect()
Dim cd As New System.Data.SqlClient.SqlCommand("SELECT [Name],[NameID] FROM [RepairName] order by [Name]", cn)
Dim adp As New System.Data.SqlClient.SqlDataAdapter(cd)
Dim ds As New DataSet
adp.Fill(ds)
cBx1.DisplayMember = "Name"
cBx1.ValueMember = "NameID"
cBx1.DataSource = ds.Tables(0)
End Sub
Sub updatecombo2()
Call connect()
Dim cd As New System.Data.SqlClient.SqlCommand("SELECT [RepairType],[RepairTypeID] FROM [RepairType] order by [RepairType]", cn)
Dim adp As New System.Data.SqlClient.SqlDataAdapter(cd)
Dim ds As New DataSet
adp.Fill(ds)
cBx2.DisplayMember = "RepairType"
cBx2.ValueMember = "RepairTypeID"
cBx2.DataSource = ds.Tables(0)
End Sub
Sub updatecombo3()
Call connect()
Dim cd As New System.Data.SqlClient.SqlCommand("SELECT [Service],[ServiceID] FROM [Service] order by [Service]", cn)
Dim adp As New System.Data.SqlClient.SqlDataAdapter(cd)
Dim ds As New DataSet
adp.Fill(ds)
cBx1.DisplayMember = "Service"
cBx1.ValueMember = "ServiceID"
cBx1.DataSource = ds.Tables(0)
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If cBx1.Enabled = True Then
Dim str As String = "insert into MaintenanceTask (MainID, TypeID, PartCost, LaborCost, Total) values (" & (cBx1.SelectedValue.ToString()) & ", " & (cBx2.SelectedValue.ToString()) & ", " & CInt(tBx1.Text) & "," & CInt(tBx2.Text) & "," & CInt(tBx3.Text) & ")"
Call connect()
Dim cd As New System.Data.SqlClient.SqlCommand(str, cn)
cd.Connection.Open()
cd.ExecuteNonQuery()
cd.Connection.Close()
MsgBox(" New Task is added successfully ")
Call lockall()
Me.Close()
Call IssueWorkOrder.listView2load()
Else
MsgBox(" Task is not added Try again ")
End If
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
AddService.Show()
AddService.Visible = True
End Sub
Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged
RadioButton1.Text = "Preventive"
End Sub
Private Sub RadioButton2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton2.CheckedChanged
RadioButton2.Text = "Repair"
End Sub
Private Sub RadioButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.Click
Call updatecombo3()
Label3.Text = "Service"
cBx2.Enabled = False
End Sub
Private Sub RadioButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton2.Click
Call updatecombo1()
Call updatecombo2()
Label3.Text = "Repair"
cBx2.Enabled = True
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Me.Close()
End Sub
End Class
[edit]Code block added - OriginalGriff[/edit]