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1. In the Solution Explorer, right-click Position.aspx, and then select Set as Start Page. 2. Double-click the file. Visual Studio displays the page in the form designer.
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3. Press F7 to display the code editor. 4. Add the following global declaration to the top of the class: 5. Public Position as Integer 6. Add the following lines to the Page_Load Sub: 7. If Me.IsPostBack Then 8. 9. Me.dsCategories1 = CType(ViewState("dsCategories"), DataSet) Me.Position = CType(ViewState("Position"), Integer)
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10. 11. 12. 13. 14.
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Else Me.daCategories.Fill(Me.dsCategories1.Categories) ViewState("dsCategories") = Me.dsCategories1 ViewState("Postion") = 0 End If
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Me.DataBind() This code is very similar to the procedure we used in 12 to store the DataSet with the page, but we re also storing the value of the new variable, Position. 15. Select (Base Class Events) in the Control Name combo box, and then select DataBinding in the Method Name combo box. Visual Studio adds the event handler to the code. 16. Add the following lines to the procedure: 17. Dim dr As DataRow 18. 19. dr = Me.dsCategories1.Categories.DefaultView(Position).Row 20. Me.txtCatID.Text = DataBinder.Eval(dr, "CategoryID") 21. Me.txtName.Text = DataBinder.Eval(dr, "CategoryName") Me.txtDescription.Text = DataBinder.Eval(dr, "Description") The first two lines declare a local variable, dr, and set it to the row of the Categories table specified by the Position variable. The next three bind the value of columns in the row to the Text properties of the appropriate controls. 22. Select btnNext in the Control Name combo box, and then select Click in the Method Name combo box. Visual Studio adds the event handler to the code. 23. Add the following lines to the procedure: 24. If Me.Position < Me.dsCategories1.Categories.Count Then 25. 26. 27. End If The code checks that the current value of Position is less than the number of rows in the Categories table, and if so, it increments the value and stores it to the ViewState. 28. Select btnPrevious in the Control Name combo box, and then select Click in the Method Name combo box. Visual Studio adds the event handler to the code. 29. Add the following lines to the procedure: 30. If Me.Position > 0 Then 31. 32. 33. Me.Position -= 1 ViewState("Position") = Me.Position DataBind() Me.Position += 1 ViewState("Position") = Me.Position DataBind()
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End If 34. Press F5. Visual Studio displays the page in the default browser.
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35. Click the Next button. The page displays the next category.
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36. Click the Previous button. The page displays the previous category.
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37. Close the browser. 38. Close the code editor and the form designer.
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1. In the Solution Explorer, right-click Position.aspx, and then select Set as Start Page. 2. Double-click the file. Visual Studio displays the page in the form designer.
3. Press F7 to display the code editor. 4. Add the following global declaration to the top of the class: public int pagePosition; 5. Add the following lines to the Page_Load method: 6. if (this.IsPostBack == true) 7. { 8. 9. 10. 11. 12. 13. this.daCategories.Fill(this.dsCategories1.Categories); 14. 15. 16. } ViewState["dsCategories"] = this.dsCategories1; ViewState["pagePosition"] = 0; this.dsCategories1 = (dsCategories) ViewState["dsCategories"]; this.pagePosition = (int) ViewState["pagePosition"]; } else {
this.DataBind(); This code is very similar to the procedure we used in 12 to store the DataSet with the page, but we re also storing the value of the new variable, pagePosition. 17. In the Properties Window of the form designer, select Position from the controls combo box. Click the Events button, and then doubleclick the DataBinding event. Visual Studio adds the event handler to the code. 18. Add the following lines to the Position_DataBinding procedure: 19. 20. 21. 22. 23. dr = this.dsCategories1.Categories.DefaultView[pagePosition].Row; this.txtCatID.Text = DataBinder.Eval(dr, "CategoryID").ToString(); this.txtName.Text = (string) DataBinder.Eval(dr, "CategoryName"); DataRow dr;
this.txtDescription.Text = (string) DataBinder.Eval(dr, "Description");
The first two lines declare a local variable, dr, and set it to the row of the Categories table specified by the Position variable. The next three bind the value of columns in the row to the Text properties of the appropriate controls. 24. In the form designer, double-click the Next button. Visual Studio adds the event handler to the code. 25. Add the following lines to the procedure: 26. if (this.pagePosition < this.dsCategories1.Categories.Count) 27. { 28. 29. 30. } The code checks that the current value of Position is less than the number of rows in the Categories table, and if so, it increments the value and stores it to the ViewState. 31. In the Form Designer, double-click the Previous button. Visual Studio adds the event handler to the code. 32. Add the following lines to the procedure: 33. if (this.pagePosition > 0) 34. { 35. 36. 37. } 38. Press F5. Visual Studio displays the page in the default browser. this.pagePosition ; ViewState["pagePosition"] = this.pagePosition; DataBind(); this.pagePosition++; ViewState["pagePosition"] = this.pagePosition; DataBind();
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