state lost Dynamic control in asp.net

every time dynamic control
you have responsibility to recreate when post back. that 's the reason state and data lost

Handle Dynamic button click event ASP.NET

Dim btnConfig As New Button
btnConfig.ID = "Config" + dr("confignum").ToString
btnConfig.Text = dr("configname")
btnConfig.CommandName = "ShowPart"
btnConfig.CommandArgument = dr("confignum")
btnConfig.CssClass = "SingleConfigBtn"
AddHandler btnConfig.Command, AddressOf btnConfig_Click
plcConfigList.Controls.Add(btnConfig)

Sub btnConfig_Click(ByVal send As Object, ByVal e As CommandEventArgs)
showPartList(e.CommandArgument) 'dr("confignum") in this case will be received
End Sub