Hi
I am making a flash card sort of program for Japanese. They have 2 character sets Hiragana and Katakana. I got the Hiragana one to work but now I added the Katakana one and it screwing up my Hiragana. Like say they are on the Hiragana section and choose the characters they want and hit the next. It then goes to the katakana section so they can choose what they want but say they forgot one character they want in the Hiragana section so they hit the backbutton(that I have provided).
I get this error:
1 Server Error in '/Japanese' Application.
2 --------------------------------------------------------------------------------
3
4 An error has occurred because a control with id 'ctl00$ContentPlaceHolder1$ctl16' could not be located or a different control is assigned to the same ID after postback. If the ID is not assigned, explicitly set the ID property of controls that raise postback events to avoid this error.
5 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.
6
7 Exception Details: System.Web.HttpException: An error has occurred because a control with id 'ctl00$ContentPlaceHolder1$ctl16' could not be located or a different control is assigned to the same ID after postback. If the ID is not assigned, explicitly set the ID property of controls that raise postback events to avoid this error.
8
9 Source Error:
10
11 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
12
13 Stack Trace:
14
15
16 [HttpException (0x80004005): An error has occurred because a control with id 'ctl00$ContentPlaceHolder1$ctl16' could not be located or a different control is assigned to the same ID after postback. If the ID is not assigned, explicitly set the ID property of controls that raise postback events to avoid this error.]
17 System.Web.UI.Page.ProcessPostData(NameValueCollec tion postData, Boolean fBeforeLoad) +911
18 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3776
19
20
21
Before I added the new kataKana section I could go back without getting this error but it would not keep the results(it would clear all the boxes that where checked).
Now the code.
Code:
1 /*Declares an arraylist that will store the checked checkboxes */
protected ArrayList checkBoxStore = new ArrayList();
protected ArrayList checkBoxStoreKata = new ArrayList();
/* Declares an arraylist that will store the images of the checked items */
protected ArrayList imageStore = new ArrayList();
protected ArrayList imageStoreKata = new ArrayList();
protected void makeHiragana()
2 {
3 SqlCommand comm;
4 SqlDataReader reader;
5 /* Grabs the stuff out of the database */
6 comm = new SqlCommand("SELECT HiraganaCharacter,HiraganaImage FROM Hiragana", getConnection());
7 /* opens the database */
8 comm.Connection.Open();
9 reader = comm.ExecuteReader();
10 try
11 {
12 /* reads through the database */
13 while (reader.Read())
14 {
15
16 /* make a new CheckBox */
17 CheckBox newCheckBox = new CheckBox();
18
19 /* put the letter from the database into the ID of the checkbox */
20 newCheckBox.ID = (string)reader["HiraganaCharacter"];
21
22 /* make a new image control */
23 Image image = new Image();
24 image.Width = 40;
25
26
27 /* put the image url fromt he database into the image control */
28 image.ImageUrl = (string)reader["HiraganaImage"];
29
30 /*add the check boxes to an arraylist */
31 this.checkBoxStore.Add(newCheckBox);
32 /* add the images to an arraylist*/
33 imageStore.Add(image);
34 }
35
36 makeTable();
37
38 }
39 catch (SqlException ex)
40 {
41 Response.Write(ex.Message);
42 }
43 finally
44 {
45 /* closes the connections */
46 comm.Connection.Close();
47 reader.Close();
48 }
49 }
50
51 protected void makeTable()
52 {
53 /*Makes the table to format the checkboxes and Images a bit better. */
54 int numcells = 5;
55 /* counts all the checkboxes and divides it by the cells then checks to see if a whole row is
56 * made with mode if not a new row will be made */
57 int numrows = (checkBoxStore.Count / numcells) + (checkBoxStore.Count % numcells > 0 ? 1 : 0);
58 for (int j = 0; j < numrows; j++)
59 {
60 /* makes a new table row */
61 TableRow row = new TableRow();
62 /* makes the cells of the table */
63 for (int i = 0; i < numcells; i++)
64 {
65 /* accounts for the last row where it would only have one in the whole row */
66 int index = (j * numcells) + i;
67 if (index >= checkBoxStore.Count)
68 {
69 break;
70 }
71 /* makes the table cell */
72 TableCell c = new TableCell();
73 /* takes the current image stored in the arraylist and sticks it in the control */
74 Control img = (Control)imageStore[index];
75 /* adds the control to the table cell */
76 c.Controls.Add(img);
77 /* takes the current checkbox stored in the arraylist and sticks it in the control */
78 Control checkBox = (Control)checkBoxStore[index];
79 /* adds the control to the table cell */
80 c.Controls.Add(checkBox);
81 /* adds the cells to the row */
82 row.Cells.Add(c);
83 }
84 Table1.Rows.Add(row);
85
86
87
88 }
89 }
90
91 protected void makeKatakana()
92 {
93 SqlCommand comm;
94 SqlDataReader reader;
95 /* Grabs the stuff out of the database */
96 comm = new SqlCommand("SELECT KatakanaCharacter,KatakanaImage FROM Katakana", getConnection());
97 /* opens the database */
98 comm.Connection.Open();
99 reader = comm.ExecuteReader();
100 try
101 {
102 /* reads through the database */
103 while (reader.Read())
104 {
105
106 /* make a new CheckBox */
107 CheckBox newCheckBox = new CheckBox();
108
109 /* put the letter from the database into the ID of the checkbox */
110 newCheckBox.ID = reader["KatakanaCharacter"].ToString();
111
112 /* make a new image control */
113 Image image = new Image();
114 image.Width = 40;
115
116
117 /* put the image url fromt he database into the image control */
118 image.ImageUrl = reader["KatakanaImage"].ToString();
119
120 /*add the check boxes to an arraylist */
121 this.checkBoxStoreKata.Add(newCheckBox);
122 /* add the images to an arraylist*/
123 imageStoreKata.Add(image);
124 }
125 /*Makes the table to format the checkboxes and Images a bit better. */
126 int numcells = 5;
127 /* counts all the checkboxes and divides it by the cells then checks to see if a whole row is
128 * made with mode if not a new row will be made */
129 int numrows = (checkBoxStoreKata.Count / numcells) + (checkBoxStoreKata.Count % numcells > 0 ? 1 : 0);
130 for (int j = 0; j < numrows; j++)
131 {
132 /* makes a new table row */
133 TableRow row = new TableRow();
134 /* makes the cells of the table */
135 for (int i = 0; i < numcells; i++)
136 {
137 /* accounts for the last row where it would only have one in the whole row */
138 int index = (j * numcells) + i;
139 if (index >= checkBoxStoreKata.Count)
140 {
141 break;
142 }
143 /* makes the table cell */
144 TableCell c = new TableCell();
145 /* takes the current image stored in the arraylist and sticks it in the control */
146 Control img = (Control)imageStoreKata[index];
147 /* adds the control to the table cell */
148 c.Controls.Add(img);
149 /* takes the current checkbox stored in the arraylist and sticks it in the control */
150 Control checkBox = (Control)checkBoxStoreKata[index];
151 /* adds the control to the table cell */
152 c.Controls.Add(checkBox);
153 /* adds the cells to the row */
154 row.Cells.Add(c);
155 }
156
157 Table2.Rows.Add(row);
158
159
160 }
161
162
163 }
164 catch (SqlException ex)
165 {
166 Response.Write(ex.Message);
167 }
168 finally
169 {
170 /* closes the connections */
171 comm.Connection.Close();
172 reader.Close();
173 }
174 }
Like I have its own table for the katakana and I even made different arrays to store the stuff but nothing seems to stop that error from coming(unless I remove the makeKatakana() and makeTableKata() then I can go back and won't get that error).
If needed I can post my file up so you guys can dl and maybe have a better time seeing it.
Why am I getting this Server Error?
