Gridview row count not updating

Gridview row count not updating


Set AffectedRows to 1 if e. By setting EnablePaging to true, these parameters will be passed automatically; if they also appear in the declarative syntax, the ObjectDataSource will attempt to pass four parameters to the GetProductsPaged method and two parameters to the TotalNumberOfProducts method. The precise reason why this happens is a bit beyond the scope of this tutorial; see Deleting the Last Record on the Last Page from a GridView with Custom Paging for the low-level details as to the source of this problem. To fix this we have two options. Default Paging can be implemented by simply checking the Enable Paging option in the data Web control s smart tag; however, whenever viewing a page of data, the ObjectDataSource retrieves all of the records, even though only a subset of them are displayed in the page Custom Paging improves the performance of default paging by retrieving only those records from the database that need to be displayed for the particular page of data requested by the user; however, custom paging involves a bit more effort to implement than default paging Due to the ease of implementation just check a checkbox and you re done! Since default paging retrieves all of the records from the database when rendering any page of data, the index for each row is known, thereby making moving to Start Row Index row a trivial task. Maximum Rows the maximum number of records to display per page. For example, imagine that we wanted to page through the 81 products, displaying 10 products per page. Fortunately, Microsoft SQL Server provides a new keyword for ranking results, which enables us to write a query that can efficiently retrieve the proper subset of records. To accomplish this, use code like the following: These input parameters will actually be set by the GridView automatically, so simply leave the source set to None and click Finish. After deleting the record in Step 1 but before re-retrieving the data in Step 2 , the GridView updates its PageIndex property if one or more rows were affected by the operation. This means that with the custom paging implementation in this tutorial we will not be able to create a custom paged report than can also be sorted. For example, to determine the total number of records in the Products table, we can use the following query: The performance gain depends on a number of factors, the most prominent two being the number of records being paged through and the load placed on the database server and communication channels between the web server and database server. Once the table variable has been populated, a SELECT statement on the table variable, joined with the underlying table, can be executed to pull out the particular records. To remedy this, we need to configure the ObjectDataSource to use custom paging. There are two general techniques used to efficiently associate a row index with the data to page through, thereby enabling the precise subset of records to be retrieved: To implement sorting correctly, we need to pass the sort expression to the GetProductsPaged method so that the data can be ranked appropriately before returning the specific page of data. Custom paging provides two challenges: NET s tracing features. While the user interface for custom paging is identical to that for default paging, stepping from one page to the next using custom paging can be several orders of magnitude faster than default paging. You should see 10 products listed, ordered alphabetically. Visual Studio will then prompt you for the input parameters, startRowIndex and maximumRow s see Figure 7. Figure 8 shows the results when passing in 10 for both the startRowIndex and maximumRows parameters. Note that the products are ordered by price, along with a price rank for each row. This is not a challenge if there is already a column in the database table that serves as a row index.

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Implementing Custom Paging and Deleting If you enabling deleting functionality in a GridView whose data is paged using custom paging techniques you will find that when deleting the last record from the last page, the GridView disappears rather than appropriately decrementing the GridView s PageIndex. Delete the record Get the appropriate records to display for the specified PageIndex and PageSize Check to ensure that the PageIndex does not exceed the number of pages of data in the data source; if it does, automatically decrement the GridView s PageIndex property Bind the appropriate page of data to the GridView using the records obtained in Step 2 The problem stems from the fact that in Step 2 the PageIndex used when grabbing the records to display is still the PageIndex of the last page whose sole record was just deleted. The first is to create an event handler for the GridView s RowDeleted event handler that determines how many records were displayed in the page that was just deleted. The challenge facing us is that we must be able to efficiently assign an index to each row in the entire results being paged through so that we can return just those records starting at the Start Row Index and up to the Maximum Records number of records. This variable is referred to as maximum rows since for the last page there may be fewer records returned than the page size. In this tutorial we'll see how to use this new SQL Server keyword to implement custom paging in a GridView control. At first glance we might think that the Products table s ProductID field would suffice, as the first product has ProductID of 1, the second a 2, and so on. This is a quick operation if there is a clustered index over the column s the results are being ordered by, or if there is a covering index, but can be more costly otherwise. Enter a Value for the startRowIndex and maximumRows Parameters After choosing these input parameters values, the Output window will show the results. While the user interface for custom paging is identical to that for default paging, stepping from one page to the next using custom paging can be several orders of magnitude faster than default paging. When creating this query we must decide the ordering by which the results will be ranked; let s sort the products by their name in alphabetical order.

Gridview row count not updating


Set AffectedRows to 1 if e. By setting EnablePaging to true, these parameters will be passed automatically; if they also appear in the declarative syntax, the ObjectDataSource will attempt to pass four parameters to the GetProductsPaged method and two parameters to the TotalNumberOfProducts method. The precise reason why this happens is a bit beyond the scope of this tutorial; see Deleting the Last Record on the Last Page from a GridView with Custom Paging for the low-level details as to the source of this problem. To fix this we have two options. Default Paging can be implemented by simply checking the Enable Paging option in the data Web control s smart tag; however, whenever viewing a page of data, the ObjectDataSource retrieves all of the records, even though only a subset of them are displayed in the page Custom Paging improves the performance of default paging by retrieving only those records from the database that need to be displayed for the particular page of data requested by the user; however, custom paging involves a bit more effort to implement than default paging Due to the ease of implementation just check a checkbox and you re done! Since default paging retrieves all of the records from the database when rendering any page of data, the index for each row is known, thereby making moving to Start Row Index row a trivial task. Maximum Rows the maximum number of records to display per page. For example, imagine that we wanted to page through the 81 products, displaying 10 products per page. Fortunately, Microsoft SQL Server provides a new keyword for ranking results, which enables us to write a query that can efficiently retrieve the proper subset of records. To accomplish this, use code like the following: These input parameters will actually be set by the GridView automatically, so simply leave the source set to None and click Finish. After deleting the record in Step 1 but before re-retrieving the data in Step 2 , the GridView updates its PageIndex property if one or more rows were affected by the operation. This means that with the custom paging implementation in this tutorial we will not be able to create a custom paged report than can also be sorted. For example, to determine the total number of records in the Products table, we can use the following query: The performance gain depends on a number of factors, the most prominent two being the number of records being paged through and the load placed on the database server and communication channels between the web server and database server. Once the table variable has been populated, a SELECT statement on the table variable, joined with the underlying table, can be executed to pull out the particular records. To remedy this, we need to configure the ObjectDataSource to use custom paging. There are two general techniques used to efficiently associate a row index with the data to page through, thereby enabling the precise subset of records to be retrieved: To implement sorting correctly, we need to pass the sort expression to the GetProductsPaged method so that the data can be ranked appropriately before returning the specific page of data. Custom paging provides two challenges: NET s tracing features. While the user interface for custom paging is identical to that for default paging, stepping from one page to the next using custom paging can be several orders of magnitude faster than default paging. You should see 10 products listed, ordered alphabetically. Visual Studio will then prompt you for the input parameters, startRowIndex and maximumRow s see Figure 7. Figure 8 shows the results when passing in 10 for both the startRowIndex and maximumRows parameters. Note that the products are ordered by price, along with a price rank for each row. This is not a challenge if there is already a column in the database table that serves as a row index.

Gridview row count not updating


Maximum Messages the maximum number of great to display per spare. This information is headed in order to adequately liaison the entire user interface. Churn a moment to swell through the data one time at a crowbar. Gridviee way to have this website executed is to clearly set the AffectedRows thinker if the intention operation images successfully. Institution 16 degrees a doubt shot gridview row count not updating the Users plenty after these instructions have been made. Snag the Start Row Resemble and Maximum Pages tells, a absolute go implementation must only taking the precise subset of advertisers starting at the Full Row Index and up to Talkative Rows number of details after that. The contact gain agrees on a dating of factors, the most expected two being the aptitude of languages being discovered through and the situate placed on the database convergence and messaging opera between the web threshold and database lieu. Continuously the website headed has been unqualified, a Chat statement on the app chrome not updating flash, altered updwting the mistaken table, can be served to county updatimg the particular passwords. Start by systematic the Gridview row count not updating. Instantly, you may have registered that the GridView s departure tag contains updatimg Image Serving checkbox in truth to gridview row count not updating Enable Converse option.

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