ASP.NET เลือกข้อมูลใน Dropdownlist ถ้าเลือกเป็นค่าที่ อื่นๆ ให้โชว์ Textbox ที่ซ่อนทำยังไงครับ

Protected Sub DDLJob1_SelectedIndexChanged1(ByVal sender As Object, ByVal e As System.EventArgs) Handles DDLJob1.SelectedIndexChanged
        If DDLJob1.SelectedValue = DDLJob1.Items.IndexOf(DDLJob1.Items.FindByValue("งานอื่นๆ")) Then
            txtJob1.Enabled = True
        Else
            txtJob1.Enabled = False
        End If
    End Sub

Protected Sub DDLJob1_SelectedIndexChanged1(ByVal sender As Object, ByVal e As System.EventArgs) Handles DDLJob1.SelectedIndexChanged
         If DDLJob1.SelectedIndex = DDLJob1.Items.IndexOf(DDLJob1.Items.FindByValue("งานอื่นๆ")) Then
            txtJob1.Enabled = True
        Else
            txtJob1.Enabled = False
        End If
    End Sub

Protected Sub DDLJob1_SelectedIndexChanged1(ByVal sender As Object, ByVal e As System.EventArgs) Handles DDLJob1.SelectedIndexChanged
       If DDLJob1.SelectedIndex = DDLJob1.Items.IndexOf(DDLJob1.Items.FindByText("งานอื่นๆ")) Then
            txtJob1.Enabled = True
        Else
            txtJob1.Enabled = False
        End If
    End Sub

Protected Sub DDLJob1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DDLJob1.SelectedIndexChanged
        If DDLJob1.SelectedIndex = DDLJob1.Items.IndexOf(DDLJob1.Items.FindByValue("งานอื่นๆ")) Then
            txtJob1.Enabled = True
        Else
            txtJob1.Enabled = False
        End If
    End Sub

if(!IsPostBack)
{
 DT = New DataTable
            DT.Load(MyReader)
            DDLJob1.DataSource = DT
            DDLJob1.DataTextField = "JobName"
            DDLJob1.DataValueField = "JobName"
            DDLJob1.DataBind()
            MyReader.Close()
}

Protected Sub DDLJob1_SelectedIndexChanged1(ByVal sender As Object, ByVal e As System.EventArgs) Handles DDLJob1.SelectedIndexChanged
        If DDLJob1.SelectedItem.Value = "งานอื่นๆ" Then // แก้ตรงนี้ครับ
            txtJob1.Enabled = True
        Else
            txtJob1.Enabled = False
        End If
    End Sub