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Hello All... This is my first post so please be gentle with me and I will try to explain the issue I've been fighting with for 3 days.

I am trying to update a gridview element from a different thread. This update task is part of an outer foreach loop that need to hold until the user has completed their selections in the updated gridview.

I shall try to describe the function here:

Every object below is contained inside an AJAX UpdatePanel

I call a function from a button.

This method parses the input from an asp:textbox and adds it to a string array via a split on the ";" character.

I then process each entry with a foreach loop.

In the foreach loop I perform a search on the entry and check whether the search returns multiple results or a single result.

If the search returns multiple results then I want to hold the foreach loop and add the those results to a popup gridview.

Once the user has completed selecting the appropriate gridview results they click a close button on the gridview popup and the foreach loop should continue as before until another entry with multiple search results is found.

I have tried to solve this using threading and an AutoResetEvent object, but until now I have had no success.

I seem to run into the issue that the user interface locks up and does not display the GridView

Example:

// instantiate the AutoResetEvent object  
static AutoResetEvent wh = new AutoResetEvent(false);  
  
// method to process user input  
protected void btn_ResolveUserInput_Click(object sender, EventArgs e)  
{  
    // split user input into string array  
    string[] usrInput = tbx_UserInput.Text.Split(';');  
  
    // process each entry in the array  
    foreach(string entry in usrInput)  
    {  
        // search database or what not for results corresponding to the current entry being prcessed  
        ArrayList results = new ArrayList(SearchStuff(entry))  
  
        // if the entry being process returned multiple results process here  
        if(result.Count > 1)  
        {  
            Thread workerThread = new Thread(new ThreadStart(delegate() {  
              
			// create dataset and datatable to bind to gridview later  
			DataSet dsMultipleResults = new DataSet();  
			DataTable dtMultipleResults = dsMultipleResults.Tables.Add("MultipleResults");  
			// create columns for datatable  
			dtMultipleResults.Columsn.Add("ResultName");  
	  
			// instantiate row in datatable  
			DataRow drMultipleResults = null;  
	  
			// process each of the multiple results retruned and add to datatable  
			foreach(string resultName in results)  
			{  
				drMultipleResults = dtMultipleResults.NewRow();  
				drMultipleResults["ResultName"] = resultName;  
				dtMultipleResults.Rows.Add(drMultipleResults);  
			}  
			// bind datatabel to gridview  
			gridView.DataSource = dsMultipleResults.Tables[0];  
			gridView.DataBind();
            
            })).Start(); 

	wh.WaitOne();			 
        }  
    }  
}  
  
// method to close multiple results dialogue  
protected void btn_CloseMultipleResultsDialogue_Click(object sender, EventArgs e)  
{  
    wh.Set();  
}

Edited by ProjectEchelon: n/a

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Last Post by ProjectEchelon
0

Hello All... This is my first post so please be gentle with me and I will try to explain the issue I've been fighting with for 3 days.

I am trying to update a gridview element from a different thread. This update task is part of an outer foreach loop that need to hold until the user has completed their selections in the updated gridview.

I shall try to describe the function here:

Every object below is contained inside an AJAX UpdatePanel

I call a function from a button.

This method parses the input from an asp:textbox and adds it to a string array via a split on the ";" character.

I then process each entry with a foreach loop.

In the foreach loop I perform a search on the entry and check whether the search returns multiple results or a single result.

If the search returns multiple results then I want to hold the foreach loop and add the those results to a popup gridview.

Once the user has completed selecting the appropriate gridview results they click a close button on the gridview popup and the foreach loop should continue as before until another entry with multiple search results is found.

I have tried to solve this using threading and an AutoResetEvent object, but until now I have had no success.

I seem to run into the issue that the user interface locks up and does not display the GridView

Example:

// instantiate the AutoResetEvent object  
static AutoResetEvent wh = new AutoResetEvent(false);  
  
// method to process user input  
protected void btn_ResolveUserInput_Click(object sender, EventArgs e)  
{  
    // split user input into string array  
    string[] usrInput = tbx_UserInput.Text.Split(';');  
  
    // process each entry in the array  
    foreach(string entry in usrInput)  
    {  
        // search database or what not for results corresponding to the current entry being prcessed  
        ArrayList results = new ArrayList(SearchStuff(entry))  
  
        // if the entry being process returned multiple results process here  
        if(result.Count > 1)  
        {  
            Thread workerThread = new Thread(new ThreadStart(delegate() {  
              
			// create dataset and datatable to bind to gridview later  
			DataSet dsMultipleResults = new DataSet();  
			DataTable dtMultipleResults = dsMultipleResults.Tables.Add("MultipleResults");  
			// create columns for datatable  
			dtMultipleResults.Columsn.Add("ResultName");  
	  
			// instantiate row in datatable  
			DataRow drMultipleResults = null;  
	  
			// process each of the multiple results retruned and add to datatable  
			foreach(string resultName in results)  
			{  
				drMultipleResults = dtMultipleResults.NewRow();  
				drMultipleResults["ResultName"] = resultName;  
				dtMultipleResults.Rows.Add(drMultipleResults);  
			}  
			// bind datatabel to gridview  
			gridView.DataSource = dsMultipleResults.Tables[0];  
			gridView.DataBind();
            
            })).Start(); 

	wh.WaitOne();			 
        }  
    }  
}  
  
// method to close multiple results dialogue  
protected void btn_CloseMultipleResultsDialogue_Click(object sender, EventArgs e)  
{  
    wh.Set();  
}

can't you use AJAX ModelPopupExtender to show data in Grid inside this ModelPopupExtender ?

0

It is not an issue getting the popup.

The issue is that the gridview is not updated because calling waitone locks the the UI interface I think...

The popup part is not a problem to achieve.

Maybe I am just confused because I have tried so many different ways of achieving this.

Edited by ProjectEchelon: n/a

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