displaying data from gridview ASP4.0 - C#

Question

hi
i have a panel having grid view with only tow columns one is CHECKBOX and other is id, need to show data on right side of the grid of the specific row on selecting the check box C#
i have populated the datagrid and added a templeta control as check box i have also fired this event on checkbox changed
GridView1_SelectedIndexChanged1
one it comes to get the value of specifis cell throwing me exception "object refrence not set at the instance of..... use the new key word"
any fruitfull suggestions
thanks in advance

karthick kumar · Answer

hi First of all check whether the row is selected or not .you mentioned that u have only two columns o ne is CHECKBOX and other is id . when u try to get the Cells[3] value u may get this exception.provide exact cell value.

Manikavelu Velayutham · Answer

You need to loop through the rows in gridivew. Find the check box control in each row and check for the checked value if its true then find the nth columns value... CheckBox chkName = (CheckBox )GridView1.Rows[count].FindControl(chkName); if (chkName.Checked == true) { // do your code here }

faraz akram · Answer

u r right  and i have done all of the above problem is that check box event is not actually selecting the row that is y the row and cell both ar null throwing this exception My question is that how i would b able to select a datagrid row through an item template check box in order to get the columns values. thanks in adv

Manikavelu Velayutham · Answer

There is two possiblities of error. 1. There is no selectedrow in the grid so you just need to check selectedrow not equals to null there 2. There is no Cells[3] in that selectedrow. before using the cells[3] you need to check not equals to null. To solve this issue put a debugger in that line and add a quick watch to see the exact output.

faraz akram · Answer

this is for adding a check box in datagrid : asp : TemplateField HeaderText =Select> ItemTemplate > asp : CheckBox ID =chkSelect runat =server AutoPostBack =True oncheckedchanged =chkSelect_CheckedChanged /> ItemTemplate > HeaderTemplate > HeaderTemplate > asp : TemplateField > and this is code behind for check box check changed GridViewRow row = GridView1.SelectedRow; string s = GridView1.SelectedRow.Cells[3].Text; ----> here comes the exception

Manikavelu Velayutham · Answer

It seems to be checkbox was not found through your code. Hence the error object reference not found. can you paste your code here so that we can easily fix the bug in your code