Error 1 Use Of Unassigned Local Variable Asp Net
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Error 1 Use Of Unassigned Local Variable C#
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million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Use of unassigned local variable up vote 0 down vote favorite ... ... ... try { string Tags_collect; SqlDataReader Data1 use of unassigned local variable string = cmd.ExecuteReader(); Data1.Read(); lbl_q_title.Text = Data1["subject"].ToString(); Data1.NextResult(); while (Data1.Read()) { Tags_collect = Data1.GetString(0); Tags_collect= Tags_collect+ Tags_collect; } lbl_tags.Text = Tags_collect; ..... .... .... not sure why i get this error what do i miss? c# asp.net variables share|improve this question asked May 10 '10 at 19:57 Bob 812 Tags_collect is an unassigned local variable. The execution may never enter the while block. –flq May 10 '10 at 19:59 How use of unassigned local variable array about telling us where the compiler specifically complains? –Joe May 10 '10 at 20:00 add a comment| 5 Answers 5 active oldest votes up vote 7 down vote accepted The first time you assign to Tags_collect is inside the while (Data1.Read()) loop, which is not guaranteed to ever execute. Fix this by initializing the variable when it's declared: string Tags_collect = string.Empty; Better yet, use a StringBuilder instead of relying on repeated concatenations: StringBuilder tags = new StringBuilder(); // ... while (Data1.Read()) { string tag = Data1.GetString(0); sb.Append(tag); sb.Append(","); // Separator } lbl_tags.Text = tags.ToString(); Concatenating a string to itself in a loop is very inefficient because strings are immutable, so each concatenation creates a brand-new instance. Using a StringBuilder prevents this by using a single buffer. share|improve this answer answered May 10 '10 at 19:58 Aaronaught 91k19193284 +1 Note to @Bob, everything after "better yet" can be ignored until you feel like tackling performance/memory usage issues. It's important info, but not related to your "unassigned variable" problem. –dss539 May 10 '10 at 20:27 add a comment| up vote 2 down vote Because if Data1.Read() returns false at the beginning Tags_collect is not assigned. share|improve this answer answered May 10 '10 at 19:59 brickner 4,92412647 add a comment| up vote 1 down vote The compi
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Use Of Unassigned Local Variable Struct
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developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a http://stackoverflow.com/questions/2805995/use-of-unassigned-local-variable community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C# unassigned local variable error up vote 2 down vote favorite I am new to C#. I am trying to complile the following program but it throws an error given at the end: http://stackoverflow.com/questions/1235791/c-sharp-unassigned-local-variable-error I know I am making a silly mistake. Any help would be much appreciated: static void Main(string[] args) { IntPtr hCannedMessages = CannedMessagesInit(); using (StreamReader sr = new StreamReader(CANNED_MESSAGE_FILE)) { String line, sub; all_integer_IDs[] myobjarray;// = new all_integer_IDs[10]; for (int c = 0; c < 10; c++) { myobjarray[c] = new all_integer_IDs(); } line = sr.ReadLine(); Console.WriteLine(line); if (line.Length > 15) { sub = line.Remove(line.IndexOf(' ', 2)); Console.WriteLine("{0} \n",sub); myobjarray[0].setvalues((int)sub[2], (int)sub[3], (int)sub[4], (int)sub[5]); Console.WriteLine("{0}, {1}, {2}, {3}", myobjarray[0].m_messageID, myobjarray[0].m_messagetype, myobjarray[0].m_classID, myobjarray[0].m_categoryID); } Console.Read(); sr.Close(); } } } } And the class is in Class1.cs file in the same project and is as follows: public class all_integer_IDs { public all_integer_IDs() { setvalues(0, 0, 0, 0); } ~all_integer_IDs() { } public void setvalues (int messageID, int messagetype, int classID, int categoryID) { this.m_messageID = messageID; this.m_messagetype = messagetype; this.m_classID = classID; this.m_categoryID = categoryID; } public int m_messageID; public int m_messagetype; public int m_classID; public int m_categoryID; } The
here for a quick overview of the site Help Center Detailed answers to any questions http://stackoverflow.com/questions/4110251/use-of-unassigned-local-variable you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers http://forums.asp.net/t/1181586.aspx?error+use+of+unassigned+local+variable or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a use of community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Use of unassigned local variable up vote 1 down vote favorite I've got problem with writing a converter from hex to bin, dec to bin etc. Here's my code, when I debug it use of unassigned I've got an error "Use of unassigned local variable Dec_Int10", could you help me? How can I fix this error? protected void Button_Click (object sender, Event Args e) { if (Page.IsValid) { int Dec_Int10; if(!(string.IsNullOrEmpty(TextBox1.Text))) { Dec_Int10 = Convert.ToInt32(TextBox1.Text, 10))); } if(!(string.IsNullOrEmpty(TextBox2.Text))) { Dec_Int10 = Convert.ToInt32(TextBox2.Text, 16))); } if(!(string.IsNullOrEmpty(TextBox3.Text))) { Dec_Int10 = Convert.ToInt32(TextBox3.Text, 8))); } if(!(string.IsNullOrEmpty(TextBox4.Text))) { Dec_Int10 = Convert.ToInt32(TextBox4.Text, 2))); } string Dec_Str10 = Convert.ToString(Dec_Int10, 10); string Hex_Str16 = Convert.ToString(Dec_Int10, 16); string Oct_Str8 = Convert.ToString(Dec_Int10, 8); string Bin_Str2 = Convert.ToString(Dec_Int10, 2); TextBox1.Text = Dec_Str10; TextBox2.Text = Hex_Str16; TextBox3.Text = Oct_Str8; TextBox4.Text = Bin_Str2; } } c# asp.net .net-3.5 .net-4.0 share|improve this question edited Nov 28 '11 at 17:55 Joel Coehoorn 248k92440661 asked Nov 5 '10 at 21:27 Alliah 3623 A precise error message?!? Never! –user166390 Nov 6 '10 at 0:11 add a comment| 7 Answers 7 active oldest votes up vote 4 down vote You get that error because there is no default value assig
ASP.NET Community Standup Forums Help Home/ASP.NET Forums/.NET Languages/C#/error use of unassigned local variable error use of unassigned local variable [Answered]RSS 8 replies Last post Jul 01, 2009 05:29 AM by surya_bg2000 ‹ Previous Thread|Next Thread › Print Share Twitter Facebook Email Shortcuts Active Threads Unanswered Threads Unresolved Threads Support Options Advanced Search Reply bendJoe Member 352 Points 465 Posts error use of unassigned local variable Nov 13, 2007 01:54 PM|bendJoe|LINK Hi, I am trying to populate two strings by stepping through two listboxes and then using these strings as arguments to a method. protected void AddUserToRolesButton_Click(object sender, EventArgs e) { string[] users; string[] roles; //ArrayList users; //ArrayList roles; for (int i = 0; i < RolesListBox.Items.Count; i++) { if (RolesListBox.Items[i].Selected == true) roles[i]= RolesListBox.SelectedItem.Text; } for (int i = 0; i < UsersListBox.Items.Count; i++) { if (UsersListBox.Items[i].Selected == true) users[i] = UsersListBox.SelectedItem.Text; } Roles.AddUsersToRoles(users, roles); } But am getting this error. Use of unassigned local variable 'roles' Use of unassigned local variable 'users' Please help. Reply ecbruck All-Star 88260 Points 9668 Posts Re: error use of unassigned local variable Nov 13, 2007 02:51 PM|ecbruck|LINK You declared the array, but did not instantiate it. You forgot something like this: users = new string[10] Reply bendJoe Member 352 Points 465 Posts Re: error use of unassigned local variable Nov 13, 2007 03:30 PM|bendJoe|LINK Thanks. I had posted another question before but still looking for an answer . Do you know whether it is possible to set the autopostback to true and selectionmode =multiple for a ListBox at the same time. I was trying to do this. I have two listboxes one displays Roles the other Users. I am setting the property selectionmode = multiple on both. And I am using the AddUserstoRoles method of the Roles class. The problem is this the Listbox showing the Roles has autopostback set to true so that I can populate a GridView showing users in that role at the selectedindex change event. So