执行存储过程OnClick

Question

How can I execute a stored procedure on OnClick button with no parameters? I have the following code behind:

Protected Sub btnExport_Click(sender As Object, e As System.EventArgs) Handles btnExport.Click

        Dim exec As SqlCommand = New SqlCommand("up_ExportFile", conn)
        exec.CommandType = CommandType.StoredProcedure

End Sub

Answer 1

Supposing you have already opened the connection just add the ExecuteNonQuery method

Protected Sub btnExport_Click(sender As Object, e As System.EventArgs) Handles btnExport.Click

        Dim exec As SqlCommand = New SqlCommand("up_ExportFile", conn)
        exec.CommandType = CommandType.StoredProcedure
        exec.ExecuteNonQuery()

End Sub

However I suggest you to not keep a global variable holding your SqlConnection opened for the lifetime of your application. Remember that the ADO.NET provider for SqlServer implements the connection pooling mechanism and thus, opening a connection is a lightweight procedure.
So a better approach is

Using conn = new SqlConnection("your_connection_string_here")
    conn.Open()
    Dim exec As SqlCommand = New SqlCommand("up_ExportFile", conn)
    exec.CommandType = CommandType.StoredProcedure
    exec.ExecuteNonQuery()
End Using

In this way the connection object is created just when needed, and then closed and disposed See Using Statememt