ASP.NET

11-Sep-06 1:35

how to write DropDownList1_SelectedIndexChanged() method fro dropdownlist which is inside datagrid.

Pradeep Reddy

_AK_11-Sep-06 1:42

11-Sep-06 1:42

What you can do is put the name there in the html part of the dropdownlist(inside the datagrid) at "OnSelectedIndexChanged" and then define it in the code behind. Don't forget to make autopostback property to true.

BTW please use a better subject line. Smile | :)

Best Regards,
Apurva Kaushal

pradeep kumarappagari11-Sep-06 1:51

11-Sep-06 1:51

public void ddl3(object sender,System.EventArgs e)
{
calculate1();

}

iam using name ddl3 in inlinecode

public void calculate1()
{
TextBox tb1,tb2;
DropDownList dl1,dl2;
tb1=(TextBox)DataGrid1.FindControl("TextBox3");
tb2=(TextBox)DataGrid1.FindControl("TextBox4");
dl1=(DropDownList)DataGrid1.FindControl("DropDownList3");
dl2=(DropDownList)DataGrid1.FindControl("DropDownList4");

tb1.Text=dl2.SelectedValue;
int a=int.Parse(dl1.SelectedValue);
int b=int.Parse(dl2.SelectedValue);
int c=a/b;
tb2.Text=c.ToString();

}

this is giving error

Pradeep Reddy

_AK_11-Sep-06 1:52

11-Sep-06 1:52

What error?

Best Regards,
Apurva Kaushal

pradeep kumarappagari11-Sep-06 1:59

11-Sep-06 1:59

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Pradeep Reddy

_AK_11-Sep-06 2:01

11-Sep-06 2:01

you try accessing the dropdownlist like this in the event:
DropDownList list = (DropDownList)sender

and then use it.

Best Regards,
Apurva Kaushal

pradeep kumarappagari11-Sep-06 2:08

11-Sep-06 2:08

sir can u plz explain me little bit clearly this

Pradeep Reddy

_AK_11-Sep-06 2:13

11-Sep-06 2:13

Actually why you were getting the error because you were not been able to get the control and then was using it that why you getting that object reference.. error.
In you event just set the reference for the dropdownlist and check whether it works or not.
suppose this your method:
public void Test(object sender, System.EventArgs e)
{

DropDownList list = (DropDownList)sender;
string hh = list.SelectedItem.ToString(); //to get the selected string.

}

Best Regards,
Apurva Kaushal

pradeep kumarappagari11-Sep-06 2:29

11-Sep-06 2:29

thank u sir, i got it

Pradeep Reddy

_AK_11-Sep-06 2:31

Re: neel help plz... [modified]

11-Sep-06 2:31

always welcome.. Smile | :)

BTW one more thing don't call me sir, apurva will be ok. Smile | :)

Best Regards,
Apurva Kaushal

pradeep kumarappagari11-Sep-06 8:10

11-Sep-06 8:10

public void aa(object sender,System.EventArgs e)
{
DropDownList dl=(DropDownList)sender;
ss=dl.SelectedValue.ToString();----->this is working fine
TextBox tb=(TextBox)DataGrid1.FindControl("TextBox1");
tb.Text=ss;------->this is giving error

}

-- modified at 1:13 Tuesday 12th September, 2006

Pradeep Reddy

_AK_11-Sep-06 19:37

11-Sep-06 19:37

You can't get the textbox(which is inside the datagrid) like this. You need to have the find the index and then to find the control.
Probably first get the datagrid item like this:

TableCell cell = list.Parent as TableCell;<br />
DataGridItem item = cell.Parent as DataGridItem;

then you try to find the textbox control in it.

Best Regards,
Apurva Kaushal

pradeep kumarappagari11-Sep-06 21:30

11-Sep-06 21:30

TextBox tb1,tb2;
DropDownList dl1,dl2;
dl1=(DropDownList)sender;
string ss=dl1.SelectedValue.ToString();
tb1=(TextBox)DataGrid1.Items[0](i was missing this).FindControl("TextBox3");
tb1.Text=ss;

thank u i got the solution

Pradeep Reddy

_AK_11-Sep-06 21:35

11-Sep-06 21:35

Best Regards,
Apurva Kaushal

Amit Kumar Chikara11-Sep-06 1:46

Amit Kumar Chikara

11-Sep-06 1:46

If I am not wrong, you have added this drop down in the edit Item template of Datagrid. What you can do is, You can go to the HTML source code and where there you have added this Edit Item Template you can add an event for dropdown in the HTML code itself.

<asp:dropdownlist id="DropDownList1" onselectedindexchanged="DropDownList1_SelectedIndexChanged" runat="server">

Regards,

Amit Kumar
HDISM, PGDCA, MCP, MCAD, MCSD
amit_chikara2002@hotmail.com

pradeep kumarappagari11-Sep-06 1:57