Question

Need to convert VB.Net code to C#

Asked by: Anushart

Here is my VB.Net code
......................................................
 If Trim(Request.QueryString("id")) <> "" And Not (IsPostBack) Then
            'create sql statement to get record by "id"
             Dim DS As New DataSet
            Dim SqlString As String
            SqlString = "Select date,title,Description,Author,Checker from TBL_PRESS_RELEASE where ID=" & (Request.QueryString("id")        
    Dim DataAdapter1 As New SqlDataAdapter(SqlString, ConfigurationSettings.AppSettings("ConnStr"))
            DataAdapter1.Fill(DS)
            TitleTextBox.Text = DS.Tables(0).Rows(0).Item("Title")
            DateTextBox.Text = DS.Tables(0).Rows(0).Item("Date")
            AuthorDropDownList.Items(0).Value = DS.Tables(0).Rows(0).Item("Author")
            FreeTextBox1.Text = DS.Tables(0).Rows(0).Item("Description")
         End If
Let me know if I need to declare any built in classes on top of my page
Thank You!

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Asked On
2008-06-13 at 08:41:00ID23483115
Topics

Miscellaneous Programming

,

Microsoft Visual C#.Net

,

Microsoft Visual Basic.Net

Participating Experts
2
Points
500
Comments
13

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Answers

 

by: VBRocksPosted on 2008-06-13 at 08:48:00ID: 21780136

Untested:

{
    if (Strings.Trim(Request.QueryString("id")) != "" & !(IsPostBack)) {
       
        //create sql statement to get record by "id"
        DataSet DS = new DataSet();
        string SqlString;
        SqlString = "Select date,title,Description,Author,Checker from TBL_PRESS_RELEASE where ID=" + Request.QueryString("id");
        SqlDataAdapter DataAdapter1 = new SqlDataAdapter(SqlString, ConfigurationSettings.AppSettings("ConnStr"));
        DataAdapter1.Fill(DS);
        TitleTextBox.Text = DS.Tables(0).Rows(0).Item("Title");
        DateTextBox.Text = DS.Tables(0).Rows(0).Item("Date");
        AuthorDropDownList.Items(0).Value = DS.Tables(0).Rows(0).Item("Author");
        FreeTextBox1.Text = DS.Tables(0).Rows(0).Item("Description");
    }
}

 

by: AnushartPosted on 2008-06-13 at 08:58:47ID: 21780246

Error      1      'System.Linq.Strings' is inaccessible due to its protection level      
Error      2      Non-invocable member 'System.Web.HttpRequest.QueryString' cannot be   used like a method.      
Error      3      Non-invocable member 'System.Web.HttpRequest.QueryString' cannot be used like a method.      
Error      4      Non-invocable member 'System.Configuration.ConfigurationSettings.AppSettings' cannot be used like a method.
Error      5      Non-invocable member 'System.Data.DataSet.Tables' cannot be used like a method.      
Error      6      Non-invocable member 'System.Data.DataSet.Tables' cannot be used like a method.      
Error      7      Non-invocable member 'System.Data.DataSet.Tables' cannot be used like a method.      


I'm getting the above errors...Can you help me out ..

 

by: VBRocksPosted on 2008-06-13 at 09:39:50ID: 21780580

Does your VB code work?

What kind of classes are you declaring at the top using the "Imports" statement?

 

by: jaime_olivaresPosted on 2008-06-13 at 09:42:24ID: 21780605

notice that in C#, collecction indexers are used with brackets [], not with parenthesis ()
So, this line:
TitleTextBox.Text = DS.Tables(0).Rows(0).Item("Title")

should be:
TitleTextBox.Text = DS.Tables[0].Rows[0].Item["Title"]

similar for other lines.

 

by: VBRocksPosted on 2008-06-13 at 09:45:44ID: 21780625

Good catch!  Looks like I need to find a new converter tool...  :)

 

by: jaime_olivaresPosted on 2008-06-13 at 09:55:57ID: 21780719

unfortunately, converters are not so smart to determine if a parenthesis in vb is refered to a method or an indexer.
you will have to do it manually. But it is relatively easy, just follow the error messages.

 

by: VBRocksPosted on 2008-06-13 at 10:02:21ID: 21780764

Right, I know C#.  It's just been a while...

 

by: AnushartPosted on 2008-06-13 at 10:16:23ID: 21780886

Thank You ...but  this
TitleTextBox.Text = DS.Tables[0].Rows[0].Item["Title"]
is giving another error as Sysytem.Data.Datarow doesnot contain a definition for item..
Even the intellisense doesnt show item after DS.Tables[0].Rows[0].
Can you let me know how to access  item in table using C#

 

by: jaime_olivaresPosted on 2008-06-13 at 10:20:09ID: 21780918

try with:
TitleTextBox.Text = DS.Tables[0].Rows[0]["Title"];

 

by: AnushartPosted on 2008-06-13 at 10:39:16ID: 21781100

Error      1      Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)      

this is the error I get  at TitleTextBox.Text = DS.Tables[0].Rows[0]["Title"];

 

by: VBRocksPosted on 2008-06-13 at 10:50:24ID: 21781199

TitleTextBox.Text = DS.Tables[0].Rows[0]["Title"].ToString();

 

by: VBRocksPosted on 2008-06-13 at 10:56:29ID: 21781256

Anushart:  C# is REALLY picky about things being perfect, or "spelled out" if you will...  Every "i" has to
be dotted and every "t" has to be crossed.

Because a DataColumn in a DataTable can be any DataType (String, Int32, Boolean, etc), you have
to explicitly "cast" it to it's correct type.  Casting can be performed using the Convert class:

3 examples:

                string s= Convert.ToString(row[0]);
                int32 i = Convert.ToInt32 (row[0]);
                bool b = Convert.ToBoolean(row[0]);

 

by: AnushartPosted on 2008-06-13 at 10:56:38ID: 21781258

TitleTextBox.Text = (string)DS.Tables[0].Rows[0]["Title"];
Solved this
Thank you!!

20120131-EE-VQP-002

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