深入理解C#编程中的组件-事件-委托

SqlConnection conn = new SqlConnection(strConnection);

try

{

conn.Open();

}

catch(SqlException ex)

{

MessageBox.Show("数据库不能打开!请检查有关参数."，"Error"，MessageBoxButtons.OK);

return false;

}

SqlDataAdapter da = new SqlDataAdapter(strSQL，conn);

DataSet ds = new DataSet();

try

{

da.Fill(ds，this.strTableSet);

}

catch(SqlException ex)

{

......

}

foreach(DataRow row in ds.Tables[this.strTableSet].Rows)

{

if(row != null)

{

bOK = true;

}

}

.......

}

else

{

bOK = false;

}

return bOK;

}

private void btnOK_Click(object sender， System.EventArgs e)

{

if(txtID.Text != ""&&txtName.Text !=""&&txtPWD.Text !="")

{

intLoginTime++;

bLogin = TestUserInDB(new EventLoginArgs(txtID.Text，txtName.Text，txtPWD.Text));