How to add button name and text dynamically to gridview button?

Question

I have added login button to DataGridView programmatically. I want to check field logintime from database and if it is null the button name should be login else it's name should be logout .

private void frmAttendance_Load(object sender, EventArgs e) 
{ 
    GetData();//Fetch data from database 
    DataGridViewButtonColumn buttonLogin = new DataGridViewButtonColumn(); 
     buttonLogin.Name = "Login"; 
    buttonLogin.Text = "Login"; 
    buttonLogin.UseColumnTextForButtonValue = true; 
    dataGridView1.Columns.Add(buttonLogin); 
    // Add a CellClick handler to handle clicks in the button column. 
    dataGridView1.CellClick += new DataGridViewCellEventHandler(dataGridView1_CellClick); 
}

Answer 1

To add a button column you can:

var button=new DataGridViewButtonColumn();
button.Name="LoginButton";
button.HeaderText="Login";
button.Text = "Login";
button.UseColumnTextForButtonValue = true;

this.dataGridView1.Columns.Add(button);

To set text of button column dynamically

To show "Login" text on each button, its enough to set:

button.Text = "Login";
button.UseColumnTextForButtonValue = true;

Also if you need to set different text for buttons, you can use CellFormatting event of DataGridView and Set the value of those cells:

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    //If this is header row or new row, do nothing
    if (e.RowIndex < 0 || e.RowIndex == this.dataGridView1.NewRowIndex)
        return;

    //If formatting your desired column, set the value
    if (e.ColumnIndex=this.dataGridView1.Columns["LoginButton"].Index)
    {
        //You can put your dynamic logic here
        //and use different values based on other cell values, for example cell 2
        //this.dataGridView1.Rows[e.RowIndex].Cells[2].Value
        e.Value = "Login";
    }
}

You should assign this handler to CellFormating event:

this.dataGridView1.CellFormatting += dataGridView1_CellFormatting;

Answer 2

You can go hrough the DataGridView in a loop:

foreach(DataGridViewRow row in dataGridView1.Rows)
{
    DataGridViewCell cell = row.Cells[0] //Button column index.
    //Put your data logic here.
    cell.Value = "Login";
}

But in this case, you have to know the column index of your DataGridViewButtonColumn