[Solved] ASP.Net Error: operator cannot be applied to operands of type string and string

In order to compare you need to convert the label text to integer and then compare with integer value.

else if (Convert.ToInt32(lbType.Text) <= 9)
{
    Response.Write("<script language='javascript'>alert('Please Input Bale Barcode');</script>");
}

Hi akhter,

Please refer below Sample.

HTML

<asp:Label ID="lblType" runat="server" Text="10"></asp:Label>
<br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="Submit" />

Code

C#

protected void Submit(object sender, EventArgs e)
{
    if (Convert.ToInt32(lblType.Text) <= 10)
    {
        Response.Write("<script language='javascript'>alert('Please Input Bale Barcode');</script>");
    }
}

VB.Net

Protected Sub Submit(ByVal sender As Object, ByVal e As EventArgs)
    If Convert.ToInt32(lblType.Text) <= 10 Then
        Response.Write("<script language='javascript'>alert('Please Input Bale Barcode');</script>")
    End If
End Sub

Screenshot