crystal reports: failed to open connection: code 17

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C#

SQL-Server

CrystalReports

I am working on a application, which includes some reports.
The main problem is that my reports work perfectly on my local computer, but when I try to run those reports on client server architecture the following error comes up and application stop working.
The error is:

failed to open the connection.
details. [database vendor code : 17 ]
failed to open the connection.
temp_2353434p-45325-74453-657453 
{}.rpt
details. [database vendor code : 17 ]

I just would like to know how I can fix this error or how I should change the connection string so that it will automatically connect with database and fill the report with data.

I use the following code for getting data form table

RptQuizResult cryRpt = new RptQuizResult();

          ParameterFieldDefinitions crParameterFieldDefinitions;
          ParameterFieldDefinition crParameterFieldDefinition;
          ParameterValues crParameterValues = new ParameterValues();
          ParameterDiscreteValue crParameterDiscreteValue = new ParameterDiscreteValue();

          crParameterDiscreteValue.Value = textBox1.Text;
          crParameterFieldDefinitions = cryRpt.DataDefinition.ParameterFields;
          crParameterFieldDefinition = crParameterFieldDefinitions["QuizID"];
          crParameterValues = crParameterFieldDefinition.CurrentValues;

          crParameterValues.Clear();
          crParameterValues.Add(crParameterDiscreteValue);
          crParameterFieldDefinition.ApplyCurrentValues(crParameterValues);

          crystalReportViewer1.ReportSource = cryRpt;
          crystalReportViewer1.Refresh();

Thanks in advance