[C#] How Can I replace it .

Fixed .

loop through all fields and try something like this
.replace(".",",")

Nulled.

I guess he means something like this:

(may contain some errors, I don't know C#)

for (int i = 0; i < this.dataGridView2.Items.Count; i++) {
String val = this.dataGridView2.Items[i].toString();
this.dataGridView2.Items[i].Value = val.replace(".", ",");
}

Something in that way. Loop through every single cell and replace the "," with ".".

Use
String nameitlikeuwant = this.rowset(...).Value.Replace(",",".")

this.rowset(...) = nameitlikeuwant

Problem Fixed .
Thanks anyway

can you post the code how you save the DataGridView to the DB?