how to clear all the values of the datagidview?

Question

2.50/5 (2 votes)

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i am making a datagrid that displays the data on the basis of a search button..
for first try the program displayed without any errors...but when i clicked the search button next time with the different attribute to search on...the problem occured...the privious value was still there in the database.
here is my code:

C#

private void btnSearch_Click(object sender, EventArgs e)
       {

           int name = Convert.ToInt32(cboxJewlName.SelectedValue);
           int material=Convert.ToInt32(cboxJewlMaterial.SelectedValue) ;
          DataTable table = Bllcombohelper.getAllSelectedJewl(name, material);
          int roows=table.Rows.Count;
           int j=0;
           while (j < roows)
           {
               if (j > 14)
               {


                   dgvSearch.Rows.Add(1);
                  dgvSearch.ScrollBars = ScrollBars.Vertical;


               }
               dgvSearch.Rows[j].Cells[0].Value = table.Rows[j].ItemArray[0].ToString();
               dgvSearch.Rows[j].Cells[1].Value = table.Rows[j].ItemArray[5].ToString();
               dgvSearch.Rows[j].Cells[2].Value = table.Rows[j].ItemArray[6].ToString();
               dgvSearch.Rows[j].Cells[3].Value=table.Rows[j].ItemArray[7].ToString()+"/-";
               dgvSearch.Rows[j].Cells[4].Value = table.Rows[j].ItemArray[4].ToString();

               j = j + 1;


           }
 }

i don't know why on clicking on the search button next time....the old data in the data grid is not flushed or cleared..
please help me with this

Posted 15-Aug-11 8:18am

amsainju

Updated 15-Aug-11 8:36am

v3

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4 solutions

Solution 3

Let the dataGridView is attached to the DataSet ds

Simply use the statment ds.Clear();

Posted 15-Aug-11 14:57pm

Harmanjeet Singh

Comments

amsainju 16-Aug-11 0:32am

i tried dgvSearch.Clear() too but it didn't helped...i am still nowhere.

Solution 5

as u said, it didn't worked. I think you might not have updated the GridView.

Do like this

ds.Tables["Table-Name"].Rows.Clear();
GridViewX.DataSource = ds.Tables["Table-Name"];

If using ASP.NET, add one more like

GridViewX.DataBind();

It will definitely work..
best of Luck :)

Posted 16-Aug-11 2:43am

Harmanjeet Singh

Solution 4

if (dgvSearch.Rows.Count > 0)
{
dgvSearch.Rows.Clear();
dgvSearch.Rows.Add(15);
}

i had forgetten to use dgvSearch.Rows.Add(15); in my code
the error was shown because dgvSearch.Rows.Clear() clears or say deletes all the empty rows that i used for a better design...
thank u all for your help

Posted 16-Aug-11 1:44am

amsainju

Comments

nagendrathecoder 16-Aug-11 8:21am

You can edit your question, no need to post an answer for updating your question.

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#realJSOP · Accepted Answer · 2011-08-15T08:38:00

The fastest way I know of is to do this at the very top of your method:

C#

dgvSearch.Rows.Clear();

To avoid flickering, you might want to do this:

C#

dvgSearch.BeginUpdate()
dvgSearch.Rows.Clear();

... your existing code...

dvgSearch.EndUpdate();

EDIT (after the 1-vote) ==================

Why was this 1-voted (or 2-voted for that matter)? I told him how to clear the rows. When you perform a search, clear the existing rowqs, and then re-add them with the new data you got back from your search. Even if he were inexperienced enough to assume he'd get back the same number of rows for each search, this is STILL the fastest way to clear old data unless you're using data binding. More often than not, refactoring is the nature of programming. The sooner everyone admits this to themselves, the better off everyone will be.