Require Parameter Error

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VB

Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click

        If txtCustomer_No.Text <> "" Then
            cmdDelete.CommandText = "DELETE FROM custmer WHERE Customer_No = " & txtCustomer_No.Text & ";"
            MsgBox(cmdDelete.CommandText)
            cmdDelete.CommandType = CommandType.Text
            cmdDelete.Connection = cnnOLEDB
            cmdDelete.ExecuteNonQuery()  <----- Error Msg :  No value given for one or more required parameters.

            MsgBox("Record deleted.")
            txtCustomer_No.Text = ""

            cmdDelete.Dispose()
        Else
            MsgBox("Enter the required values:" & vbNewLine & "1. Customer_No")
        End If
        cmdUpdate.Dispose()

    End Sub

Thanks in Advance ....

Posted 29-Oct-12 0:08am

important17

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OriginalGriff · Accepted Answer · 2012-10-29T00:12:00

First off, don't do it that way: Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

Second, the content of your text box is probably responsible for the error: if it contains spaces, or semicolons, or any other special characters SQL will get confused and you will get an error. You could enclose it in quotes, but using parametrised queries will fix the problem, and save your database from damage at the same time.

"So can u give one little example about parametrized ...
i m new about all this stuff.."

Try:

VB

Using con As New SqlConnection(strConnect)
    con.Open()
    Using com As New SqlCommand("DELETE FROM custmer WHERE Customer_No=@CN", con)
        com.Parameters.AddWithValue("@CN", txtCustomer_No.Text)
        com.ExecuteNonQuery()
    End Using
End Using