rebind dataset from web service after click button

blur_ivy · March 5th, 2005, 12:40 PM

hi,

i was developing a client web application which get the search file result from a web service , after getting the result, i would store it in a datagrid, then i would need to click the download button which retrieve the one value of the datagrid to be pass back to the web service, however, whenever it execute OnItemCommand="callDownloadFile" , it seems cant' retrieve the value from the datagrid, n i found tat whenever i click the download button , e.Item.DataItem will be NUL.. i know tat i need to rebind the result , however... i can't bind it properly..

anyone can help out with this? thanks..

Code:

private void Page_Load(object sender, System.EventArgs e)
{
//getAuthenticate();
if (!Page.IsPostBack)
{


callSearchFile();

}

callSearchFile();

}

public void callSearchFile()
{


DataGrid1.DataSource = service.SearchFile("text");
DataGrid1.DataBind();
}


public void callDownloadFile(Object sender, DataGridCommandEventArgs e)
{
if (e.Item.DataItem != null)
{


if(e.CommandName=="download")

{
Response.Write("second 3");
string path = ((Label)e.Item.FindControl("lblPath")).Text;
//Response.Write(strID);
}

}
else
{

Response.Write("second one");
}

Auratius · March 10th, 2005, 04:02 AM

Create a Seperate BindData method and see

[C#]
void Page_Load(Object sender, EventArgs e){
if(Page.IsPostBack != "true"){
BindData();
}
}

void BindData(){
DataSet ds = new DataSet();
SQLDataSetCommand dsc;
dsc = new SQLDataSetCommand("SELECT * FROM myTable", "[connectionString]");
dsc.FillDataSet(ds, "myTable");
[Set the DataSource properties]
Page.DataBind();
}

planoie · April 15th, 2005, 09:09 AM

The problem here isn't so much that you need to rebind. After a postback, the datasource of the grid will be NULL. Therefore, e.Item.DataItem will also be NULL.

Instead of getting data from e.Item.DataItem you need to get the data from the Items cells that are in the datagrid. That's where the data grid maintains its state.

e.Item.Cells(n).Text (for a standard BoundColumn).

-Peter