Get Users that have not entered a value in datagridview c#

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.NET2.0

I am checking which cells in a column are null or in blank and then retrieving the row Index of the empty cells found.

I use this code to find the index:

C#

StringBuilder sb = new StringBuilder();
foreach(DataGridViewRow row in mainDGV.Rows)
{      
      if(row.Cells[0].Value.ToString() == null)
      {
              sb.Append(Properties.Settings.Default.userDB[row.Index].ToString(); //this gets the username from a stringCollection using the rowIndex.
      }
}
MessageBox.Show(sb.ToString());

But this only shows me the first username that has not registered in the DGV. Even using the stringBuilder, only the first username appends to it.

How can I get all the users that have not registered (have not entered a value in the datagridview).

Thanks in Advance - CCB

Posted 5-Aug-15 16:28pm

ChrisCreateBoss

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Comments

sreeyush sudhakaran 6-Aug-15 0:59am

Sorry your question is not clear , Can you please make it more clear?

ChrisCreateBoss 6-Aug-15 15:39pm

Ok, the rows of my datagridview are created depending of the count of strings in a StringCollection allocated in the Properties.Settings.Default. I am trying to check every cell in my datagridview and see which ones are null or blank. If there are blank cells I want to get the rowIndex of each of them and based on the rowIndex, display the matching username that is allocated in the stringCollection. The problem is that, if I get three blank cells, I just get the first matching username and not all the matching ones. Now u got it?

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 6-Aug-15 2:14am

Did you debug and see what is happening?

ChrisCreateBoss 6-Aug-15 15:40pm

Yes I debug but I do not get any exceptions or errors in the code.

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sasanka sekhar panda · Answer 1 · 2015-08-05T21:18:00

C#

StringBuilder sb = new StringBuilder();
foreach(DataGridViewRow row in mainDGV.Rows)
{
//changed line
//Reason:.Tostring() method will throw  System.NullReferenceException when it
//finds a empty cell.
      if(!(row.Cells[0].Value is string))//or if( Convert.ToString(row.Cells[0].Value)=="")
      {
              sb.Append(Properties.Settings.Default.userDB[row.Index].ToString(); //this gets the username from a stringCollection using the rowIndex.
      }
}
MessageBox.Show(sb.ToString());