Code for t h e N a viga t ion Bu t t ons in Visual Basic .NET

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Code for t h e N a viga t ion Bu t t ons
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The Click event procedures for t he nav igat ion but t ons appear next . The basic synt ax for t he nav igat ion but t ons in t his sam ple follows t hose in t he Creat ing Dat a- Aware Form s sect ion. The m ain differ ence in t his inst ance is t hat we need t o specify t he dat a sour ce for t he BindingCont ext obj ect w it h a dat a set nam e and a Dat aTable nam e w it hin t he dat a set . The but t on nam e denot es t he role of each but t on. For exam ple, clicking cm dFirst shows t he first row in t he Shippers Dat aTable w it hin t he for m . Private Sub cmdFirst_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdFirst.Click Move to first record. Me.BindingContext(das1, Shippers ).Position _ = Me.BindingContext(das1, Shippers ).Position.MinValue End Sub Private Sub cmdPrevious_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdPrevious.Click Move to previous record. Me.BindingContext(das1, Shippers ).Position -= 1 End Sub Private Sub cmdNext_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdNext.Click Move to next record. Me.BindingContext(das1, Shippers ).Position += 1 End Sub Private Sub cmdLast_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdLast.Click
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Move to last record. Me.BindingContext(das1, Shippers ).Position _ = Me.BindingContext(das1, Shippers ).Position.MaxValue End Sub
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The Click event procedure for t he Modify but t on ( cm dModify ) perfor m s j ust t wo t asks. First it com m it s t he cur r ent edit if t her e is one in pr ogr ess. Second it inv okes t he Updat e m et hod for t he dap1 Dat aAdapt er. The procedur e com m it s t he cur rent edit in one of t wo ways depending on t he posit ion of t he Shippers Dat aTable row show ing in t he form . I f t he posit ion is any ot her t han t he first row ( posit ion 0) , t he pr ocedur e m ov es t o t he pr ev ious r ow and t hen t he nex t r ow. The m ov e t o t he prev ious row com m it s t he cur rent form values t o t he Shippers Dat aTable by m ov ing off t he curr ent row . Then t he m ov e t o t he next row r et ur ns t he form s focus t o t he r ow befor e t he m ove t o t he prev ious r ow. I f t he for m is show ing t he first r ow in t he Shippers Dat aTable, t he procedur e j ust issues a com m and t o m ove t o t he pr ev ious r ecord. This com m it s t he form s v alues t o t he Shippers Dat aTable w it hout changing t he r ow t hat appears in t he form . The Updat e m et hod inv ok es t he Com m and obj ect s associat ed w it h t he Updat eCom m and, I nser t Com m and, and Delet eCom m and pr opert ies of dap1. Because t he sam ple applicat ion im m ediat ely synchronizes indiv idual insert and delet e act ions, t he Updat e m et hod behind t he Modify but t on sy nchr onizes j ust rows w it h changed values in t he Shippers Dat aTable w it h t he Shippers t able in t he Nort hw ind dat abase on t he local SQL Serv er inst ance. How ev er , all changed rows since t he last click of t he Modify but t on at t em pt t o updat e cor r esponding Shippers t able rows on t he SQL Serv er inst ance. The synt ax for t he Updat e m et hod in t he sam ple specifies t he nam es for t he dat a set and t he Dat aTable wit hin it . Failing t o explicit ly generat e t he Dat aTable nam e can generat e an error in t his cont ext . Private Sub cmdModify_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Commit the current edit by moving off and returning to the current row in the DataTable. If Me.BindingContext(das1, Shippers ).Position = 0 _ Then Me.BindingContext(das1, Shippers ).Position -= 1 Else Me.BindingContext(das1, Shippers ).Position -= 1 Me.BindingContext(das1, Shippers ).Position += 1 End If Invoke the Update method to copy the change to the SQL Server data source. dap1.Update(das1, Shippers ) End Sub
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