Retrieving CheckBoxList values in C#

Well, "Information" in your code sample must refer to either a static class, or some IDataReader derived object. The red line means it isn't recognised, which will either mean you're missing a reference/namespace or the object being refered to is out of scope.

Additionally, just about any time you receive a squiggly in VS (green or red), you can mouse over the offending text and you should receive a popup describing what VS is having an issue with.

Well not sure if this helps but I tried to convert the VB code that I used before to C# and that may be where the problem is, but I don' know how to fix it :(.

VB Code:

                    ' Check for CheckBox value if empty then the CheckBox is empty
                    For Each Row As DataRow In dtStudent.Rows
                        If Not IsDBNull(Row("testid")) Then
                            TestList.Items.FindByValue(Row("testid").ToString()).Selected = True
                        End If
                    Next


C# code that was convert from above.

                    foreach (DataRow Row in dtStudent.Rows)
                    {
                        if (!Information.IsDBNull(Row["testid"]))
                        {
                            cblTests.Items.FindByValue(Row["testid"].ToString()).Selected = true;
                        }
                    }

You must use System.Convert.IsDBNull instead of Information.IsDBNull. Information class is in Microsoft.VisualBasic assembly which is not referenced in C# projects by default.

Try:

if (System.Convert.IsDBNull(Row["testid"]))
{
   // code here
}

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Hi,

Information lives in the VB NameSpace. Try the below or a variant of it this.

if (!(IsDbNull(ds.Tables[1].Rows[i]["testid"]))
  {
      cblTests.Items.FindByValue(Row["testid"].ToString()).Selected = true;
  }

Hope this helps.

Thanks,
Red-LineNetworks

use the simplest one
if (ds.Tables[1].Rows[i]["testid"] != null)
  {
      cblTests.Items.FindByValue(Row["testid"].ToString()).Selected = true;
  }

@ghayasurrehman

DBNull is not the same as null. Your example is flawed.

hi ghayasurrehman,

When i add your code i'm told that the name "ds" and "i" are not in the current context.

Just use System.Convert.IsDBNull instead of Information.IsDBNull in your first code.

Hello everyone,

for some reason when I run my code the values are not getting populated to my CheckBoxList control. Please see what I currently have. I need the code mentioned above to bind the values from the DB to the CheckBoxList control.

                    foreach (DataRow Row in dtStudent.Rows)
                    {
                        if (System.Convert.IsDBNull(Row["testid"]))
                        {
                            cblTests.Items.FindByValue(Row["testid"].ToString()).Selected = true;
                        }
                    }

Hi ghayasurrehman,

Your solution in post 33640896 did not work.

Hi mehdi_javan,

This did not work either.

>>  Hi ghayasurrehman,

>>  Your solution in post 33640896 did not work.

Of course it did not. Read post #33641588.

Perhaps you can try:

foreach (DataRow Row in dtStudent.Rows)
{
    if (!(Row.IsNull("testid"))
    {
        cblTests.Items.FindByValue(Row["testid"].ToString()).Selected = true;
    }
}

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Thank you. That worked out GREAT!!!!