查找从C＃中的数据集中检查哪个单选按钮

Question

I'm saving the checked radio button number in the database. If the column contains the number then the radio button shows it's checked and the if the column contains null/empty then the radio button is unchecked.

int chk;
if(DBNull.Value.Equal(dataset.table["TableName"].Rows[i][9].ToSting()))

{ 

     chk = dsData.Tables["Option"].Rows[n][9].ToString();

     switch(chk)
     {
         case 1: radioButton1.Checked=true;
         break;
         .
         .
         .
         case 4: radioButton4.Checked=true;
         break;
     }
}

else

{
      radioButton1.Checked=false; . . .  radioButton4.Checked=false;
}

but it gives always empty value. plz give the solution on it

Answer 1

Look of empty string where you expect null in datatable, secondly you are passing string in switch which is check but using int value you might need case "1": instead of case 1:

if(dataset.table["TableName"].Rows[i][9].ToSting() != "")
{     
     chk = dsData.Tables["Option"].Rows[n][9].ToString();    
     switch(chk)
     {
         case 1: radioButton1.Checked=true;
         break;
         .
         .
         .
         case 4: radioButton4.Checked=true;
         break;
     }
}    
else    
{
      radioButton1.Checked=false; . . .  radioButton4.Checked=false;
}