How to dataset empty in c#

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hi to all,
Here i using business logic that method return dataset. for me that dataset return null. how to check.
For eg:

C#

for (int i = 0; i < dsAccSId1.Tables[0].Rows.Count; i++)
{
  string company = dsAccSId1.Tables[0].Rows[i]["Accid"].ToString();
  string getbill = "Select * from tblbillmaster where company ='" + company + "'";
  DataSet getcomp = dbObj.InlineExecuteDataSet(getbill);
  if (getcomp.Tables[0].Rows.Count > 0)
  {
    ds.Merge(getcomp);
  }
}
return ds;

above example here i merging dataset .if the count not exists then ds should be empty even column not bind.how to resolve this problem.

What I have tried:

here i check null but it no use it will process next step and then i got error table cannot find 0

Posted 3-Mar-16 23:49pm

JOTHI KUMAR Member 10918227

Updated 4-Mar-16 17:55pm

VR Karthikeyan

v3

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[no name] 4-Mar-16 5:59am

If you are getting dataset as null then you need to check null(if(getcomp != null)) before performing any action.

VR Karthikeyan 4-Mar-16 5:59am

Can't understand your question, please improve your question.

Richard Deeming 4-Mar-16 6:18am

Your code is vulnerable to SQL Injection[^].

NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

3 solutions

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OriginalGriff · Answer 1 · 2016-03-04T00:34:00

Try:

C#

if (getcomp != null && getcomp.Tables.Count > 0)
   {
   ...
   }

But as Richard says: Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.
Google for "Bobby Tables" and don't just assume it's a joke!

Amit Jadli · Answer 2 · 2016-03-04T00:55:00

Solution 2

I had same problem before so what i had used is..

if (dsAccSId1 != null && dsAccSId1.Tables.Count > 0 && dsAccSId1.Tables[0].Rows.Count > 0)
{
	
}

May be this will help you...

Posted 4-Mar-16 0:55am

Amit Jadli

johnwalker10 · Answer 3 · 2016-03-04T17:55:00

Solution 3

Use the following statement

C#

if (ds.Tables[0].Rows.Count == 0)
{
    //
}

Posted 4-Mar-16 17:55pm

johnwalker10