Column 'abc' does not belong to table problem?

Question

1.00/5 (1 vote)

See more:

0 down vote
favorite
I am comparing two DataTable, if the result is false I add row to my database table. If the table database is empty it works, but when I have values in it, I got "Column 'Tags' does not belong to table". The first DataTable data is Filled from database table.

the code of comparing is the following:

C#

DataTable result = new DataTable(); 
result.Columns.Add("Tags", typeof(string));

 for (int k = 0; k < result.Rows.Count; k++)
 {
     for (int j = 0; j < tableTags.Rows.Count; j++)
      {
         if (tableTags.Rows[k]["Tags"].ToString().Equals(result.Rows[j]["TagName"].ToString()))
          {
            continue;
          }
         else
         {
           AddTags(result.Rows[k]["Tags"].ToString());
           break;
          }
      }
   }

Posted 30-Apr-14 12:20pm

Member 10672813

Add a Solution

Comments

phil.o 30-Apr-14 18:30pm

Is it the real code? Because, as is, you create a DataTable, give it one column, and then iterate over its Rows collection, which at that time is empty. So you never compare anything to anything.

Member 10672813 30-Apr-14 18:33pm

No it is example code, the two tables have data, so actually rows are not empty, one DataTable have column name "Tags" and the other "TagName", I am comparing these to each other.

ZurdoDev 30-Apr-14 20:34pm

The error should be clear. That column is not in your datatable. You need to post the actual relevant code.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

phil.o · Accepted Answer · 2014-04-30T12:44:00

You wrote:

C#

if (tableTags.Rows[k]["Tags"].ToString().Equals(result.Rows[j]["TagName"].ToString()))

It should be:

C#

if (tableTags.Rows[k]["TagName"].ToString().Equals(result.Rows[j]["Tags"].ToString()))

You named the column of result variable "Tags"; I supposed you just switched their names. Why not giving them the same name?

Another possible solution is to put a breakpoint on the first line and launch the solution in debug mode. Then see line by line what the variables you declare actually contain.

altaf008bd · Accepted Answer · 2014-04-30T20:26:00

Hi, Here is a sample code to do the comparison between 2 datatables:

DataRow dr;
        DataTable result = new DataTable();
        result.Columns.Add("Tags", typeof(string));
        //
        dr = result.NewRow();
        dr[0] = "a";
        result.Rows.Add(dr);
        //
        dr = result.NewRow();
        dr[0] = "b";
        result.Rows.Add(dr);
        //
        dr = result.NewRow();
        dr[0] = "c";
        result.Rows.Add(dr);
        result.Rows.Add();
        //
        DataTable tableTags = new DataTable();
        tableTags.Columns.Add("Tags", typeof(string));
        //
        dr = tableTags.NewRow();
        dr[0] = "A";
        tableTags.Rows.Add(dr);
        //
        dr = tableTags.NewRow();
        dr[0] = "e";
        tableTags.Rows.Add(dr);
        //        
        for (int k = 0; k < result.Rows.Count; k++)
        {
            var match = from tag in tableTags.AsEnumerable() where tag.Field<String>("Tags").ToLower() == result.Rows[k]["Tags"].ToString().ToLower() select tag;
            if (match.Any())
            {
                //The tag exists, write related code here.
            }
            else
            {
                //The tag does not exist, write related code here.
            }            
        }

Column 'abc' does not belong to table problem?

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0