Help:messbox can not show normally

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messbox can not show until i press the "Alt" on the keyboard,i am confused that,
the detail is:
i run the program in "MainForm",then i open the other form ,when i need the messbox to show,it just can not work ,unless i press the "Alt" key? what's problem?please help,thanks
just paste the messbox code:

C#

//only show when press "Alt"
                MessageBox.Show(str, "the result is:");

in fact,i once met that problem ,and i found that it sometimes apears when i opend the subform with the Mainform ,i search the google , just found the similar problem in MFC ,and what's more ,i wonder this problem is just the messagebox not show on frontform,because i debug that code line and sure it is executed,but not show .

Posted 15-Jun-12 17:25pm

cyh2260629

Updated 15-Jun-12 18:34pm

Sandeep Mewara

v3

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Sergey Alexandrovich Kryukov 15-Jun-12 23:44pm

It should not happen. Showing a message box is very simple, so you must be doing something really weird. How about a (short!) code sample? See "Improve question" above.
--SA

Upniwesh 16-Jun-12 0:09am

are you using windows application or web application???????????

OriginalGriff 16-Jun-12 0:34am

The OP wrote:
"yes,the windows application, build in C# 2008"

cyh2260629 16-Jun-12 0:34am

yes,the windows application, build in C# 2008

Sergey Alexandrovich Kryukov 16-Jun-12 1:28am

No, this code sample shown nothing. How a about a complete sample? You can write a whole application in one short file (don't use designer, for this purpose) and show it. The problem is somewhere else.
--SA

Sandeep Mewara 16-Jun-12 0:37am

Showing messagebox is pretty simple, if this odd behavior is happening, it must be based on how you have designed and coded your stuff. I see the line shared on how you show messgaebox which looks just fine but the code around it matters too.

cyh2260629 16-Jun-12 1:27am

the form opend as follows:
Calculate calculateForm = new Calculate();
calculateForm.ShowDialog();
and just now i found that when the messagebox is expected to show but not ,the form can not control,Precisely it seems to be waiting,it only be ok after i press the button "Alt",and the messagebox show,after that ,the form work as usual,
so i think the problem comes to more obviously,the messagebox just not show on the frontform ,perhaps i need to force it to be , somethig like focus the form,get the focus ,am i right?
by the way ,i have multy forms int the same project,now only found the problem in this form ,how strange it is! as the code is extremely similar~~~

Sergey Alexandrovich Kryukov 16-Jun-12 1:31am

Shall we pull information from you little by little? After all, you are the one who is interested in help. Provide comprehensive information. Where is your "Main"? Do you do Application.Run?..

It's quite easy to write a whole application...
--SA

cyh2260629 16-Jun-12 1:54am

Thanks your advice,i just debug code the whole morning and i am rather confused about it.For now either the question or the expression maybe not clear,and this afeternoon i have to go for an exam,so i have to leave it to later,may be this evening. Well,thanks everyone for help.

Stephen Hewison 16-Jun-12 4:22am

This is quite a strange thing to happen. Have you ruled out a problem with your local machine by running the software on more than one computer? Do you get the same behaviour on all of them?

cyh2260629 16-Jun-12 22:06pm

Ok,i had to say that , it was mass , just before last night.And later i add another winForm to get some parameter,after that it could work,the messagebox show as usual.
Nothing is better than now!So my problem is solved,thanks a lot

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cyh2260629 · Answer 1 · 2012-06-16T16:13:00

C#

    private void menuBeginClass_Click(object sender, EventArgs e)
    {
    if (strConnect != "")
        {
        /*
    *This program is just something like Pictue Recognition
    */
            ClassMethod cmForm = new ClassMethod();
            cmForm.ShowDialog();
            bool nearChose = cmForm.GetMethod();
            int nearSize = cmForm.GetLength();
            int midPixel = (int)((nearSize - 1) / 2);

            strCommandtext = "select * from Sign";
            myConnect = new OleDbConnection(strConnect);

            DataRow myDataRow = null;
            DataTable mydataTable = new DataTable();
            mydataAdapter = new OleDbDataAdapter(strCommandtext, myConnect);
            mydataAdapter.Fill(mydataTable);
            myDataRow = mydataTable.NewRow();
            myCommBuilder = new OleDbCommandBuilder(mydataAdapter);

            try
            {
                //MessageBox.Show("Connect db sucess");
                myConnect.Open();
                ClassNum = mydataTable.Rows.Count;

                if (ClassNum > 0)
                {
                    for (int i = 0; i < mydataTable.Rows.Count; i++)
                    {
                        strRecord[i] = mydataTable.Rows[i]["ClassName"].ToString ();
                      record[i, 0] = Convert.ToInt32(mydataTable.Rows[i]["ColorR"]);
                      record[i, 1] = Convert.ToInt32(mydataTable.Rows[i]["ColorG"]);
                      record[i, 2] = Convert.ToInt32(mydataTable.Rows[i]["ColorB"]);
                 record[i, 3] =Convert.ToInt32(mydataTable.Rows[i]["redThreshold"]);
              record[i, 4] = Convert.ToInt32(mydataTable.Rows[i]["greenThreshold"]);
               record[i, 5] = Convert.ToInt32(mydataTable.Rows[i]["blueThreshold"]);
                    }
                }

                Bitmap dstBmp = countSign(record,midPixel,nearChose);

                string str = "Classify finish!:" + "\t\n";
                for (int i = 0; i < ClassNum; i++)
                {
                    str += strRecord[i] + ": " + countClass[i].ToString() + "\t\n";
                }
                /*
                 *Here is the problem,only show when press "Alt"
        */
        MessageBox.Show(str,"the result is:");

                saveFileDialog1.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Tif Image|*.tif";
                saveFileDialog1.Title = "Save an Image File";
                saveFileDialog1.ShowDialog();

                // If the file name is not an empty string open it for saving.
                if (saveFileDialog1.FileName != "")
                {
                    string FileName = saveFileDialog1.FileName;
                    switch (saveFileDialog1.FilterIndex)
                    {
                        case 0:
                            dstBmp.Save(FileName, ImageFormat.Jpeg);
                            break;
                        case 1:
                            dstBmp.Save(FileName, ImageFormat.Bmp );
                            break;
                        case 2:
                            dstBmp.Save(FileName, ImageFormat.Tiff) ;
                            break;
                        default :
                            dstBmp.Save(FileName, ImageFormat.Jpeg);
                            break;
                    }
                }

            }
            catch (OleDbException exp)
            {
                MessageBox.Show(exp.ToString());
                Application.Exit();
            }
            finally
            {
                //close connect
                myConnect.Close();
                myConnect.Dispose();
                myCommBuilder.Dispose();

                if (mydataAdapter != null)
                    mydataAdapter.Dispose();
            }
        }
}