How i can Delet Row from datagrid And database

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i use this code to delete selected datagrid from data base but it is not delete

C#

for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
   DataGridViewRow dr = dataGridView1.Rows[i];
   if (dr.Selected == true)
   {
      dataGridView1.Rows.RemoveAt(i);
      try
      {
         SqlCommand cmd = new SqlCommand("Delete from calender where ID= ' " + i + "'", con);     
         cmd.ExecuteNonQuery();
         con.Close();
      }
      catch (Exception ex)
      {
         MessageBox.Show(ex.ToString());
      }
   }
}

[edit]code block added and indexation fixed[/edit]

Posted 16-Nov-12 22:05pm

meme_307

Updated 16-Nov-12 23:09pm

Nelek

v2

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Comments

faisal23 17-Nov-12 4:15am

windows / web

n.podbielski 17-Nov-12 6:11am

No problem? No error?

meme_307 17-Nov-12 6:33am

i want to delete data from data grid
the not deleted from database
i worked in windows
i make button to delete the selected row from grid ,, it delete just from grid not data base

pryashrma 17-Nov-12 7:08am

does value of database field "ID" and variable "i" are same?

meme_307 17-Nov-12 7:26am

no it is not the same so it is not delete ,,,
,,,
now i need delete code to delete the selected row from database

meme_307 17-Nov-12 7:33am

the id not necessary in data base i cane delete it but i need delete the selected row from data grid

1 solution

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Dominic Abraham · Answer 1 · 2012-11-17T00:50:00

Solution 2

Hi
Can you try after removing space between single quotes and double quotes from query.
I.E

C#

SqlCommand cmd = new SqlCommand("Delete from calender where ID= '" + i + "'", con);

Posted 17-Nov-12 0:50am

Dominic Abraham

Comments

meme_307 17-Nov-12 6:53am

i tried it's not delete from database

Dominic Abraham 17-Nov-12 7:06am

Can you try directly removing the value from database after giving a value for i. I.E . Execute the query
Delete from calender where ID = '1' in database. Just to make sure that, there is no issues with your query/data. And if you are able to delete the data, just try the same query from code [after inserting the deleted data]

ie.

SqlCommand cmd = new SqlCommand("Delete from calender where ID= '1'", con);
cmd.ExecuteNonQuery();
con.Close();