CheckBox of DataGridView is it checked or uncecked search by row

Question

5.00/5 (1 vote)

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I want to search is the DataGridView checkbox checked or unchecked. If checked than I want to use that row. This is my problem.

My Code :

C#

private void PracticalSubjectLoad() { try { foreach (DataGridViewRow row in gdAddNewSubject.Rows) { DataGridViewCheckBoxCell CbxCell = (DataGridViewCheckBoxCell)row.Cells[1]; if(Convert.ToBoolean(CbxCell.Value) == true) gdPractical.Rows.Add(row.Cells[1].Value.ToString()); //if (Convert.ToBoolean((DataGridViewCheckBoxCell)row.Cells[1].Value) == true) //{ // gdPractical.Rows.Add(row.Cells[1].Value.ToString()); //} } //for (int i = 0; i < gdAddNewSubject.Rows.Count; i++) //{ // //if (Convert.ToByte(db.dataSet.Tables["subject"].Rows[i][1].ToString()) == 1) // //{ // // ((DataGridViewCheckBoxCell)gdAddNewSubject.Rows[0].Cells[1]).Value = true; // //} // MessageBox.Show(gdAddNewSubject.Rows.Count.ToString()); } catch (Exception ex) { MessageBox.Show(ex.Message); } }

Error: Object cannot be cast from DBNull to other types.

Additional information this code is working only when my 1st-row is checked.
Please tell me how can I solve this problem

Posted 25-Jun-12 23:16pm

UL UL ALBAB

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Comments

sarthakm 10-Sep-15 23:04pm

suppose we check a checkbox in gridview ,it should enable delete button present outside.
son in which even shall we call it?

2 solutions

Solution 2

In this sample I assume that here it is a DataGridView with three columns.

FirstName | LastName | IsRegistered

The Codes below, adds the Registered Customer to a List<t>.

C#

List<customer> list = new List<customer>();

foreach (DataGridViewRow row in this.GridView.Rows)
{
     // if a cell has never choosed so it is null 
     if ((row.Cells["IsRegistered"].Value) == null)
         continue;

     if (((bool)row.Cells["IsRegistered"].Value == true))
     {
         list.Add(new Customer() {       
            FirstName = (string)row.Cells["FirstName"].Value,
            LastName = (string)row.Cells["LastName"].Value
         };
     }
}

Let me know if you have any problem else.

Posted 25-Jun-12 23:56pm

WebMaster

Updated 25-Jun-12 23:57pm

v2

Comments

[no name] 10-Aug-12 16:15pm

For a person who vote:
What is down vote about, after 2 month?
If there is a problem with my code let me know.

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DamithSL · Accepted Answer · 2012-06-25T23:23:00

Solution 1

C#

DataGridViewCheckBoxCell CbxCell = row.Cells[1] as DataGridViewCheckBoxCell;
if (CbxCell!=null && !DBNull.Value.Equals(CbxCell.Value) && (bool)CbxCell.Value == true)
{
    gdPractical.Rows.Add(CbxCell.Value.ToString());
}

Posted 25-Jun-12 23:23pm

DamithSL

Comments

UL UL ALBAB 26-Jun-12 5:31am

Okay, its working but,
at the end sending me a message:
Object reference not set to an instance of an object.

DamithSL 26-Jun-12 5:34am

in which line you get error?

UL UL ALBAB 26-Jun-12 6:10am

Not any line. This is working but, after complete task it's getting the error.

DamithSL 26-Jun-12 6:14am

may be another issue on somewhere else, post it as another question if you can't find a solution.