Object reference not set to an instance of an object, While Filtering dataGridView

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Hello All,

Code works Fine. But While Filtering dataGridView2 i got an error"Object reference not set to an instance of an object"

C#

private void Form1_Load(object sender, EventArgs e)
       {
           BindGridForExcel();
           BindGridForSql();
       }

       private void BindGridForExcel()
       {
           try
           {
               OleDbConnection theConnection = new OleDbConnection("provider=Microsoft.ACE.OLEDB.12.0;data source=D:\\DotNet\\Copy of Depreciation working Oct-13.xlsx ;Extended Properties=\"Excel 8.0;HDR=NO;IMEX=1;\"");
               theConnection.Open();
               OleDbDataAdapter theDataAdapter = new OleDbDataAdapter("SELECT * FROM [Working$]", theConnection);
               DataSet theDS = new DataSet();
               DataTable dt = new DataTable();
               theDataAdapter.Fill(dt);
               this.dataGridView1.DataSource = dt.DefaultView;
               theConnection.Close();
           }
           catch (Exception ex)
           {

           }

       }

       private void BindGridForSql()
       {
           string connectionString = "Data Source=192.168.0.11;Initial Catalog=30_Nov_13;User ID=sa;Password=super";
           string sql = "SELECT * from [@BA_ODPV] ";

           using (var connection = new SqlConnection(connectionString))
           using (var command = new SqlCommand(sql, connection))
           using (var adapter = new SqlDataAdapter(command))
           {
               connection.Open();
               var dataEntry1 = new DataTable();
               adapter.Fill(dataEntry1);
               dataGridView2.DataSource = dataEntry1;
           }
       }

       private void dataGridView1_DoubleClick(object sender, EventArgs e)
       {
           DataGridViewSelectedRowCollection rc = null;
           rc = dataGridView1.SelectedRows;
           itemcode = rc[0].Cells["F1"].Value.ToString();
           for (int i = 0; i < dataGridView2.Rows.Count; i++)
           {
               if (dataGridView2.Rows[i].Cells[2].Value.ToString() == itemcode)
               {
                   dataGridView2.Rows[i].Selected = true;
                   dataGridView2.Rows[i].Visible = true;
               }
           }
       }

Posted 22-Nov-13 18:23pm

xibit89

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 23-Nov-13 1:12am

Debug and check on which line it throws this exception?

xibit89 23-Nov-13 1:15am

exactly on if (dataGridView2.Rows[i].Cells[2].Value.ToString() == itemcode) line

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 23-Nov-13 2:15am

That means there is no value at cell 2 position.

xibit89 23-Nov-13 2:51am

there is value in cell 2 and it also comparing it with itemcode, after completing the loop it generate the exception.

1 solution

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Karthik_Mahalingam · Answer 1 · 2013-11-22T18:37:00

Possible errors :

whenever u try to access an object index,, please make sure that the object is not null...

try adding this line

C#

 if( dt != null )
 above
this.dataGridView1.DataSource = dt.DefaultView;



try adding this line
if( rc != null && rc.count > )
 if( rc[0].cells.count > 0)
 itemcode = rc[0].Cells["F1"].Value.ToString();


if( dataGridView2 != null && datagridview2.rows.count > 0)
for (int i = 0; i < dataGridView2.Rows.Count; i++)




if( datagridview2.rows[i].cells.count >2 )
if (dataGridView2.Rows[i].Cells[2].Value.ToString() == itemcode)