Problem in selecting single checkbox in datagrid in WPF C#

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C#

WPF

RDLC

OleDb

Here, I have problem in single checkbox selection. When I select using checkbox first row only working perfect, But when I select using checkbox other row single. I can't get the checkbox value true. It gives me false. And My multiple selection working perfect. Please help me out in this problem. Thanks in advance.


Datagrid code is below :-

<datagrid x:name="dgDataArea" grid.row="2" autogeneratecolumns="False" selectionmode="Extended" selectionchanged="dgDataArea_SelectionChanged">
               <datagrid.columns>
                   <datagridtemplatecolumn x:name="chkCol">
                       <datagridtemplatecolumn.celltemplate>
                           <datatemplate>
                               <checkbox ischecked="{Binding CheckAll,UpdateSourceTrigger=PropertyChanged}" checked="InnerCheckBox_Checked" unchecked="InnerCheckBox_UnChecked" />
                           </datatemplate>
                       </datagridtemplatecolumn.celltemplate>
                   </datagridtemplatecolumn>

                   <datagridtextcolumn header="Cheque Id" binding="{Binding Bank_ID,Mode=OneWay}" visibility="Hidden" />

                   <datagridtextcolumn header="ChequeNo" binding="{Binding ChequeNo,Mode=OneWay}" />

                   <datagridtextcolumn header="Remark" binding="{Binding Remark,Mode=OneWay}" />
               </datagrid.columns>
           </datagrid>

       <checkbox x:name="chkSelectAll" grid.row="2" content="Select All" checked="chkSelectAll_Checked" unchecked="chkSelectAll_Unchecked"  />

Codebehind Side Checkbox logic is below:-

public bool SingleRecordUnselected = false;

        public bool isAllDataSelected()
        {
            return (dgDataArea.ItemsSource as List<bankmaster>).Where(t => !t.CheckAll).Select(t => t.Bank_ID).ToList().Count > 0 ? false : true;
        }

        private void InnerCheckBox_Checked(object sender, RoutedEventArgs e)
        {
            if (!chkSelectAll.IsChecked.Value)
                chkSelectAll.IsChecked = isAllDataSelected();
        }

        private void InnerCheckBox_UnChecked(object sender, RoutedEventArgs e)
        {
            if (chkSelectAll.IsChecked.Value)
            {
                SingleRecordUnselected = true;
                chkSelectAll.IsChecked = false;
            }
        }

        private void chkSelectAll_Checked(object sender, RoutedEventArgs e)
        {
            List<bankmaster> bmlist = dgDataArea.ItemsSource as List<bankmaster>;
            if (bmlist != null)
            {
                foreach (var item in bmlist)
                {
                    item.CheckAll = true;
                }
                dgDataArea.Items.Refresh();
            }
        }

        private void chkSelectAll_Unchecked(object sender, RoutedEventArgs e)
        {
            if (!SingleRecordUnselected)
            {
                List<bankmaster> bmlist = dgDataArea.ItemsSource as List<bankmaster>;
                if (bmlist != null)
                {
                    foreach (var item in bmlist)
                    {
                        item.CheckAll = false;
                    }
                    dgDataArea.Items.Refresh();
                }
            }
            else
            {
                SingleRecordUnselected = true;
            }
        }