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Questionwhy System.NullReferenceException occurred? Pin
Jassim Rahma23-Feb-13 1:54
memberJassim Rahma23-Feb-13 1:54 
Hi,

I am using the following code to activate existing MDI child and refresh the grid at the same time. It was working fine until today but suddenly I am getting:\

System.NullReferenceException occurred
Message=Object reference not set to an instance of an object.
Source=Cure
StackTrace:
at cure_hospital_management.frmMain.repositoryItemFindFile_KeyDown(Object sender, KeyEventArgs e) in C:\Users\DELL USER\Documents\Visual Studio 2010\Projects\Cure\Cure\main_form.cs:line 1718
InnerException:


here is the code:

if (e.KeyCode == Keys.Enter && (sender as TextEdit).Text.Trim() != "")
{
    this.Cursor = Cursors.WaitCursor;
 
    is_form_exists = false;
 
    foreach (Form search_resul_form in this.MdiChildren)
    {
        frmSearchResult search_form = search_resul_form as frmSearchResult;
 
        if ((string)search_form.Tag == "BROWSE_PATIENTS")
        {
            // search_form.Activated(null, null);
            search_form.find_what = "FILE";
            search_form.find_text1 = (sender as TextEdit).Text.Trim();
            search_form.find_text2 = null;
            search_form.browse_result();
            search_form.Activate();
            is_form_exists = true;
            break;
        }
    }
 
    if (is_form_exists == false)
    {
        frmSearchResult SearchResultForm = new frmSearchResult(public_var);
        SearchResultForm.Tag = "BROWSE_PATIENTS";
        SearchResultForm.MdiParent = this;
        SearchResultForm.Dock = DockStyle.Fill;
        SearchResultForm.find_what = "FILE";
        SearchResultForm.find_text1 = (sender as TextEdit).Text.Trim();
        SearchResultForm.find_text2 = null;
        SearchResultForm.Show();
    }
 
    (sender as TextEdit).Text = "";
 
    this.Cursor = Cursors.Default;
}


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AnswerRe: why System.NullReferenceException occurred? Pin
Alan N23-Feb-13 2:04
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GeneralRe: why System.NullReferenceException occurred? Pin
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GeneralRe: why System.NullReferenceException occurred? Pin
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GeneralRe: why System.NullReferenceException occurred? Pin
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