How to set selected row index of GridView?
In Gridview Events, double click SelectedIndexChanged Event and write the following code,
- protected void Gridview1_SelectedIndexChanged(object sender, EventArgs e)
- {
- txtrowid. Text = Gridview1. selected row. cells[1].
- text name. Text = Gridview1. selected row. cells[2].
- text marks. Text = Gridview1. selected row. cells[3].
- }
Table of Contents
Does the index help with updating?
An index on the update column will actually slow down your query because the index needs to be updated along with the data. An index on the where column will speed up updates and selects, but will slow down some inserts.
How do you get the reaction of the selected row in the Ag grid?
To get the selected nodes/rows of the grid, use the following API methods:
- API. getSelectedNodes() : Returns an array of selected nodes.
- API. getSelectedRows() : Returns a data array of the selected rows.
How do you make SQL update faster?
Below are 23 rules to make your SQL faster and more efficient
- Batch data deletion and updates.
- Use the automatic partitioning SQL server features.
- Convert scalar functions to table-valued functions.
- Instead of UPDATE, use CASE.
- Reduce nested views to reduce delays.
- Data pre-staging.
- Use temporary tables.
- Avoid using code reuse.
Do indexes slow down updates?
1 answer. Database indexes make database updates slower and faster at the same time. This depends on the update statement: when you have an update on all rows like update mytable set mycolumn = 4711, creating the index will slow down the update, because it’s extra time-consuming work.
How does an update to a non-indexed column affect the index?
Updates to non-indexed columns do not change the index, even if the data row is moved as a result of the update, since a forwarding record is left behind. For a heap, a forwarding log is left, so there is no need to update nonclustered indexes.
When do UPDATE statements not update the index?
An UPDATE statement that does not modify (declare in the SET list) columns in an index (including INCLUDE and clustered key columns) will not have to update that index, and the execution phase will not even touch it. DELETE and INSERT obviously touch all columns (logically) and have to update all indexes. — Remus Rusanu Jan 5
When to use row Num or column NUM in index?
A range of cells or an array constant. If the array contains only one row or column, the corresponding row_num or column_num argument is optional. If array has more than one row and more than one column, and only row_num or column_num is used, INDEX returns an array of the entire row or column in array. row_num Required, unless column_num is present.
Can you reorganize and rebuild indexes in the database?
You can remedy index fragmentation by reorganizing or rebuilding an index. For partitioned indexes created in a partition scheme, you can use either of these methods on a full index or on a single partition of an index. Rebuilding an index deletes and recreates the index.