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return a datatable from a function in C#

Posted on 2013-11-27
10
1,231 Views
Last Modified: 2014-01-05
Hi Expert,

I want return a datatable from a function, but it has error. Table1 not returned.


 private static DataTable GetDataTable(Guid recordId)
       {
           DataTable table1=null;
           String SqlScript = "Select * from table" + " Where ID='" + recordId + "'";
           using (SqlConnection con = new SqlConnection(connectionString))
           {
               con.Open();
               SqlDataAdapter adapter = new SqlDataAdapter();
               adapter.SelectCommand = new SqlCommand(SqlScript, con);
               adapter.Fill(table1);

               try
               {
                   adapter.Fill(table1);
               }
               catch (SqlException ex)
               {
                 
                string sError = ex.Message;
               }
               finally
               {
                   con.Close();
                   adapter.Dispose();
               }

               return table1;
               
            }
           
       }
       

then I call it in other method


public void List()

{

                  DataTable dt = GetDataTable(ID);

                  foreach (DataRow dr in dt.Rows)

{

}


Thanks in advance for help.
0
Comment
Question by:dshi15
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10 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39682537
You're "swallowing" the exception. Have you tried stepping through your code to see if there are any errors?
0
 
LVL 1

Author Comment

by:dshi15
ID: 39682549
yes, I went step by step.
0
 
LVL 1

Author Comment

by:dshi15
ID: 39682552
it said "Value cannot be null." datatable
0
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LVL 1

Author Comment

by:dshi15
ID: 39682572
I saw I have double adapter.Fill(table1);, I comment one now, but is has same error.



              con.Open();
               SqlDataAdapter adapter = new SqlDataAdapter();
               adapter.SelectCommand = new SqlCommand(SqlScript, con);
               //adapter.Fill(table1);

               try
               {
                   adapter.Fill(table1);
0
 
LVL 4

Expert Comment

by:AnuTiji
ID: 39683391
Hi

The adapter.Fill(dataset).. The data adapter fill method takes the dataset as parameter.

http://msdn.microsoft.com/en-us/library/system.data.common.dataadapter.fill%28v=vs.110%29.aspx
0
 
LVL 1

Author Comment

by:dshi15
ID: 39698499
>>The adapter.Fill(dataset).. The data adapter fill method takes the dataset as parameter.


The data adapter fill method can take the datatable as parameter.


I changed

DataTable table1=new DataTable();

It works.
0
 
LVL 1

Author Comment

by:dshi15
ID: 39746131
I've requested that this question be closed as follows:

Accepted answer: 0 points for dshi15's comment #a39698499

for the following reason:

It likes object need declare as new object of the class for  hold the object.
0
 
LVL 1

Accepted Solution

by:
dshi15 earned 0 total points
ID: 39746132
I worked on a project and when I had this question, I asked expert and I followed both experts solution, but they didn't work, so I tried by my-self and it works.

And this suggestion is wrong

>>The adapter.Fill(dataset).. The data adapter fill method takes the dataset as parameter.

The data adapter fill method can take the datatable as parameter.
0
 
LVL 1

Author Closing Comment

by:dshi15
ID: 39757131
My solution works.
0

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