how to show incremented value from databse in form load

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Here in form load event i m trying to take value form sql server database ID column and want to
display max(ID)+1 in textbox control

here in visual studio when i start debug its start compiling without any error but after few seconds it automatically stop debugging
help me whats the issue in my code

Public Class FrmAdddonor
Dim con As New SqlConnection(Data Source=Tarun-PC;Initial Catalog=bdsdb;Integrated Security=True)
Private Sub FrmAdddonor_Load(sender As Object, e As EventArgs) Handles MyBase.Load

txtdonorID.Enabled = False
Dim number As Integer
con.Open()
Dim Str As String =select max(ID)+1 from tbldonor;
Dim com As New SqlCommand(Str, con)
Dim reader As SqlDataReader = com.ExecuteReader()
If reader.Read() Then
number = reader("ID").ToString()
txtdonorID.Text = number
reader.Close()
con.Close()
End If

End Sub

Posted 23-Feb-14 18:48pm

Tarun Jaiswal

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2 solutions

Solution 2

VB

Public Function maxuse() as integer
        con.Open()
        sql = &quot;select IIF(ISNULL(MAX(sms_count)), 0, MAX(sms_count))  from sms_master&quot;
        Com = New OleDb.OleDbCommand(sql, con)
        maxuse = Com.ExecuteScalar()
        &#39;If _maxno = &quot;&amp;H0&quot; Then
        &#39;    _maxno = 0
        &#39;End If
        Com.ExecuteNonQuery()
        Com.Dispose()
        con.Close()
    End Sub</pre>

VB

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
       textbox1.text = maxuse() + 1
   End Sub

Posted 24-Feb-14 17:25pm

dpokiya

v2

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Raul Iloc · Accepted Answer · 2014-02-23T19:14:00

Solution 1

You have some errors in your code:
-the select statement should be: "select max(ID) as MAX from tbldonor"
-then Dim temp as integer; temp = DirectCast(reader("MAX"), Integer) + 1;
-end finally: txtdonorID.Text = temp.ToString();

Posted 23-Feb-14 19:14pm

Raul Iloc

v2