How to give Null value condition in asp.net

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I want this condition should not work when (Me.txt_rest_value_assessment.Tex) = NULL. Because in that case, it is giving an error " Conversion from double to string error"

If (Me.txt_rest_value_assessment.Tex) = NULL , then it should bypass this condition

If CDbl(Me.txt_rest_value_assessment.Text) > (CDbl(Me.txt_business_revenue_risk.Text) + CDbl(Me.txt_project_upside_value.Text)) Then

            Me.pnl_edit.Visible = True
            Me.lbl_conf_message.Text = "Rest Value Assessment value cannot be greater than Sum of Project Outlook Value and Project Upside Value."

        End If

asked 1 min ago

Bharti Pandita

37