Setting Background Color Of Button in WPF on runtime

Question

I am trying to set Background Color of Button(Names: b0,b1,b2,b3,b4,b5,b6,b7,b8,b9) in WPF on runtime.

Color Name is getting from Database that is Red right now. But it's giving me System.NullReferenceExceptionn: Object reference not set to an instance of an object

private void ButtonBgColor()
{
string qryBgColor = "select Name from lookup where code in (select VALUE from qSettings where name='BUTTON_BG_COLOR') and type='BgColor'";
try
{
sqlConnection.Open();
sqlCommand = new SqlCommand(qryBgColor, sqlConnection);
sqlDataReader = sqlCommand.ExecuteReader();
if (sqlDataReader.Read())
{
string BUTTON_BG_COLOR = sqlDataReader["Name"].ToString();
Button[] b = new Button[9];
for (int i = 0; i < b.Length; i++)
{
var textBlock08 = (TextBlock)b[i].Template.FindName("myTextBlock", b[i]);
textBlock08.Background = (System.Windows.Media.SolidColorBrush)new System.Windows.Media.BrushConverter().ConvertFromString(BUTTON_BG_COLOR);
}
}
}
catch (Exception exp)
{
MessageBox.Show(exp.ToString(), "Button Background Color Exception");
}

Can anyone help me to resolve this problem ?

Thanks in advance

score 1 · Accepted Answer · answered Mar 28 '16 at 21:13

1

You haven't assigned anything to b. It's just an empty array. Therefore, calling b[i] will always result in a null-ref.

answered Mar 28 '16 at 21:13

Jace

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18

it's in Loop, how it could be NULL? – Jaa Zaib Mar 28 '16 at 21:24
Your array is not null, but each element inside the array is null. – Jace Mar 28 '16 at 21:25
b0 is name of button – Jaa Zaib Mar 28 '16 at 21:26
var textBlock08 = (TextBlock)b[i].Template.FindName("myTextBlock", b[i]); this line of code references the b array, in which every item is null. that is what I am saying. – Jace Mar 28 '16 at 21:28
so how could i resolve this problem ? – Jaa Zaib Mar 28 '16 at 21:28
I would revisit the fundamentals of developing applications using WPF. – Jace Mar 28 '16 at 21:34

Setting Background Color Of Button in WPF on runtime

1 Answers1