how to find whether the text entered in textbox is present in sql database table in vb.net

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How to find whether the text entered in textbox is present in sql database table in vb.net. I have a text box.if i enter value in textbox while moving to next textbox, i need to find whether the value entered is present in table or not. If yes diplay msgbox or display record not found..

Thank you.

Posted 9-Jun-11 21:38pm

mahalakshmi.p19

Updated 20-Jun-11 22:17pm

v4

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mahalakshmi.p19 11-Jun-11 1:21am

hi am getting error message
unhandled exception occured in your application..
system argument exception format of initializing string does not conform to specification starting index 0.....
could you please help me to resolve this issue...

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Wayne Gaylard · Answer 1 · 2011-06-09T22:02:00

You need to create a function that returns a boolean. This function would check the database to see if the string is present.
Something like this

VB

Private Function CheckIfPresent(ByVal textToCheck As String)

        Using con As SqlConnection = New SqlConnection("your connection string")
            Dim cmd As SqlCommand = New SqlCommand("SELECT textField FROM yourTable WHERE textField = @textField", con)
            cmd.Parameters.AddWithValue("@textField", textToCheck)
            con.Open()
            Dim dr As SqlDataReader = cmd.ExecuteReader()
            Dim IsThere As Boolean = False
            If dr.HasRows Then
                IsThere = True
            End If
            dr.Close()
            Return IsThere
        End Using

    End Function

and then in your TextBox's LostFocus event you just call this function

VB

Private Sub TextBox1_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.LostFocus
        Dim textToCheck As String = TextBox1.Text
        If CheckIfPresent(textToCheck) Then
            'Do work if text is there
        Else
            'Do work if text not found
        End If
    End Sub

Hope this helps