如何使用水晶忽視的Windows應用程序這個錯誤報告

Question

公共無效CRYS（）{

con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:/Documents and Settings/techsoft/My Documents/Database.accdb;Persist Security Info=False"); 
    con.Open(); 
    OleDbCommand cmm=new OleDbCommand ("select * from Table3",con); 
    DataSet ds=new DataSet(); 
    OleDbDataAdapter db=new OleDbDataAdapter(); 
    db.SelectCommand =cmm ; 
    db.Fill (ds); 
    comboBox1 .DataSource =ds.Tables [0]; 
    comboBox1 .DisplayMember ="logindate"; 
    comboBox1 .ValueMember ="login"; 
    comboBox1.SelectedIndex = 0; 


    } 

    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) 
    { 


     CrystalReport1 cry = new CrystalReport1(); 
     //cry.SetDatabaseLogon("techsoft", "softTECH123", @"Microsoft Office Access 2007", "Database"); 
     crystalReportViewer1.SelectionFormula ="{Table3.login}=" +comboBox1.SelectedIndex; 
     crystalReportViewer1.ReportSource = cry; 

    } 

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，這是我的代碼。我的錯誤是在選擇公式，它會拋出異常，如「需要串這裏」 PLZ提出了一些解決方案

Answer 1

試試這個

crystalReportViewer1.SelectionFormula ="{Table3.login}='" +comboBox1.SelectedIndex + "'";