convert string to barcode c# A M u lt ifu n ct ion Ca lcu la t or W e b Pa ge in Visual Basic .NET

Maker ECC200 in Visual Basic .NET A M u lt ifu n ct ion Ca lcu la t or W e b Pa ge

A M u lt ifu n ct ion Ca lcu la t or W e b Pa ge
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One of t he t r uly cool feat ur es of form s on pages in ASP.NET is t hat t he propert y values for cont r ols persist bet ween r ound- t r ips t o t he serv ers. The pr eceding sam ple didn t highlight t his feat ur e because t he whole point of t hat sam ple was t o show how t o change t he values of cont r ols on successive round- t r ips t o t he serv er. This sam ple, t he WebCalculat or pr oj ect , t akes advant age of aut om at ic persist ence of cont rol propert y v alues dur ing t he round- t r ip from a br owser t o a Web serv er and back again. I f y ou did m uch ASP coding, y ou m ay r ecall t hat it was necessary t o wr it e code if you w ant ed cont rols t o display t he sam e values on t he way back fr om a server as on t he way up t o a ser ver. The WebCalculat or proj ect highlight s t he aut om at ic persist ence of cont r ol values by let t ing users ent er v alues in t w o t ext boxes. When t he user clicks one of four but t ons for a t ype of ar it hm et ic bet w een t he v alues appear ing in t he t ex t box es, t he page goes off t o t he serv er. The procedur es for perform ing t he ar it hm et ic wor k dir ect ly w it h t he Text propert y for t he t ext box cont rols on t he Web page. I n ot her words, t he values pass t o t he serv er v ia t he t ext box cont rols. Wit h t radit ional HTML form s, t he values pass t o t he ser ver as nam e and value pairs. The nam e r epresent s t he cont r ol nam e, and t he value repr esent s t he ent ry in t he cont r ol. I f values need t o appear in a page when it ret ur ns t o a browser from a serv er on a t radit ional HTML form , you m ust wr it e code t o r eassign t he values t o cont r ols on t he page t he serv er sends back t o t he br owser. The WebCalculat or proj ect is a four - funct ion calculat or. Each funct ion has it s ow n but t on w it h a Text pr opert y set t ing repr esent ing t he t ype of calculat ion it
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perform s nam ely, + , - , * , and / . Users ent er v alues in t he first t wo t ex t box es on t he Web page. Users access t his proj ect by navigat ing t o WebCalculat or.aspx in t he WebCalculat or pr oj ect . When I first creat ed t he proj ect , ASP. NET assigned WebForm 1.aspx as t he st at page nam e for t he proj ect . However, I r ev ised t he nam e t o WebCalculat or.aspx in Solut ion Explor er using t he t echnique described prev iously . When t he page goes t o t he serv er, it per form s t he calculat ion denot ed by t he but t on a user clicks. A sim ple event procedur e for each but t on handles t his. Each of t he ev ent procedur es for t he four but t ons calls anot her pr ocedur e t hat form at s t he value r et ur ned t o t he br owser in t he t hird t ext box on t he page. This form at t ing pr ocedure assigns a color t o t he t ext box For eColor propert y based on t he value r et urned and m akes t he font bold. Figur e 11- 7 shows t he WebCalculat or pr oj ect w ork ing for a pair of values in t he first and second t ext boxes. The t op w indow shows t he WebCalculat or.aspx page befor e a user click s one of t he four funct ion but t ons. Not ice t hat t he user ent er ed values in t he first and second t ext box es ( - 2.2 and 3.3) . The t hird t ext box is em pt y. The bot t om w indow shows t he page t hat ret urns from t he Web serv er aft er t he user click ed t he bot t om but t on on t he for m wit h a Text proper t y equal t o / . I n t he bot t om w indow , t he applicat ion populat es t he t hird t ext box w it h t he quot ient of - 2.2 div ided by 3.3. The t ext box displays t he result t o singleprecision accuracy. Because t he value is negat ive, it appears in r ed w it hin t he browser w indow. I n addit ion, t he value in t he t hird t ext box appears in a bold font . Figu r e 1 1 - 7 . Th e W eb Ca lcu la t or .a sp x pa ge b e for e an d a ft er a t rip t o t h e W eb se rve r. Th e u se r in vok ed t h e r ou n d - t rip t o t h e se r ve r by click in g t h e b ot t om bu t t on ( / ) .
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The but t ons on t he page hav e I D propert y set t ings of But t on1 t hrough But t on4 from t he t op but t on t o t he bot t om but t on. The cor e of t he applicat ion is t he ev ent procedur es behind each of t hese but t ons. The m odule for t he page st art s by declaring a single- pr ecision var iable nam ed sgn1. This var iable st ores t he r esult of t he calculat ion perfor m ed on t he cont ent s of Text Box1 and Text Box2. Because t he m odule declar es sgn1 as a Single dat a t ype and it s input v alues ar e conv ert ed from a St ring dat a t y pe t o a Single dat a t ype, t he result of t he ar it hm et ic com put at ion has a single dat a t ype. However, t he Text propert y of Text Box3 requir es a St r ing dat a t ype. Therefor e, t he assignm ent of sgn1 t o a Text pr opert y inv okes t he ToSt r ing m et hod t o convert a num eric value t o a st ring. Each of t he Click ev ent procedur es for t he but t ons inv ok es t he ColorTex t I nText Box3 pr ocedur e. This pr ocedur e has an I f st at em ent w it h Then, ElseI f, and Else clauses. The I f st at em ent assigns one of t hr ee colors t o Text Box3 based on t he value in sgn1. Posit iv e values r esult in a For eColor pr opert y assignm ent for Text Box 3 of gr een. Negat ive values lead t o a red For eColor propert y assignm ent . I f t he sgn1 value is 0, t he procedur e assigns black as t he for eground color for Tex t Box3. No m at t er w hat color t he pr ocedur e assigns t o t he
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ForeColor propert y for Text Box3, t he procedure concludes by m ak ing t he font bold. Dim sgn1 As Single Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Add text boxes. sgn1 = CSng(TextBox1.Text) + CSng(TextBox2.Text) TextBox3.Text = sgn1.ToString ColorTextInTextBox3() End Sub Private Sub Button2_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button2.Click Subtract text boxes. sgn1 = CSng(TextBox1.Text) - CSng(TextBox2.Text) TextBox3.Text = sgn1.ToString ColorTextInTextBox3() End Sub Private Sub Button3_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button3.Click Multiply text boxes. sgn1 = CSng(TextBox1.Text) * CSng(TextBox2.Text) TextBox3.Text = sgn1.ToString ColorTextInTextBox3() End Sub Private Sub Button4_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button4.Click Divide text boxes. sgn1 = CSng(TextBox1.Text) / CSng(TextBox2.Text) TextBox3.Text = sgn1.ToString ColorTextInTextBox3() End Sub Sub ColorTextInTextBox3() Assign forecolor to TextBox3 based on result value. If sgn1 > 0 Then TextBox3.ForeColor = Drawing.Color.Green ElseIf sgn1 < 0 Then TextBox3.ForeColor = Drawing.Color.Red Else TextBox3.ForeColor = Drawing.Color.Black End If Make font bold to highlight assignment. TextBox3.Font.Bold = True
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