Tick condition if datatable null C#

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Hi guys, i'm using tick function to show updated data from database to datatable. Now, the problem is my current database is null, data will be insert by user later. When i'm run the program it's showing error "object reference not set to an instance", now how can i make sure the tick function is running without throwing the error?

What I have tried:

C#

private void timer_Tick (object sender, EventArgs e)
{
   this.tbl_StoredDataTableAdapter.Fill(this.gpdbDataSet.tbl_StoredData);
}

Please help me. Thank you!

Posted 13-Mar-18 22:38pm

Member 13485822

Updated 13-Mar-18 23:20pm

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F-ES Sitecore 14-Mar-18 5:21am

First you need to find out what in that code is null, it could be "this", "tbl_StoredDataTableAdapter" or "gpdbDataSet". We can't run your code for you so we don't know. Next you need to decide what you want to happen when that object is null. Again we can't read your mind so we don't know. If you simply want to "do nothing" then at the start of the Tick event check if the relevant object is null and if it is just "return;"

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OriginalGriff · Accepted Answer · 2018-03-13T23:21:00

Solution 1

Simple: check for nulls.

private void timer_Tick (object sender, EventArgs e)
   {
   if (tbl_StoredDataTableAdapter != null && gpdbDataSet != null && gpdbDataSet.tbl_StoredData != null)
      {
      this.tbl_StoredDataTableAdapter.Fill(this.gpdbDataSet.tbl_StoredData);
      }
   }

Posted 13-Mar-18 23:21pm

OriginalGriff

Comments

Member 13485822 14-Mar-18 5:25am

Thank you very much!

OriginalGriff 14-Mar-18 5:26am

You're welcome!