If i want to bypass this with a if else sting.empty he says that he cannot covert string to bool.

No value given for one or more required parameters. how do i set the value of my textbox to this parameter?

change the code to this: int rowIndex = dBANBM_T075_BORGTOCHTDataGridView.CurrentRow.Index Thanks Rastgar

he is my program this is the code i use now the "val" get's his value form the program. that is the % if the field is empty. or else the value that is typed in the textfield. but the parameter doesn't get this value

First of all you should consider creating user controls instead of forms all the time. Then its the same procedure with any form you have. Set TopLevel to false and then you can insert it into any panel you like. If you want to exchange the contents of a panel then call panel.Controls.Clear() prior to adding the other form. If you want to have several items in one panel you can either set them location and size programmatically or (better) just create two panels (one holding formA and one holding formB).

but i really want to hide the first form:P

I for one, do not have a clue what you are talking about. Perhaps try asking a question, preferably with a meaningful subject line.

Quick'n dirty... In the main form, when a row in the datagrid is double clicked: private void dgInfo_DoubleClick(object sender, System.EventArgs e) { Form2 frm=new Form2(ds, dgInfo.CurrentRowIndex); frm.ShowDialog(); } In the constructor of Form2: public Form2(DataSet ds, int index):this() { textBox1.Text=ds.Tables[0].Rows[index][0].ToString(); textBox2.Text=ds.Tables[0].Rows[index][1].ToString(); textBox3.Text=ds.Tables[0].Rows[index][2].ToString(); } Helpful perhaps...

Your my hero :-) Wanna be god? I have to press my button twice. I click once.. noting happens. I click twice he loads the data Then I enter other search values I click once he shows nothing I click twice he loads the date whit the new values

Start using if statements to check which parameters to use in your SELECT query. something like: StringBuilder sb = new StringBuilder(); sb.Append ("SELECT colom1, colum2, colom3, colom4, colom5 FROM Tabel1 "); sb.Append ("WHERE "); if (param2 != string.Empty) sb.Append("(Colom1 = :param2)"); if (param3 != string.Empty) sb.Append("(Colom2 = :param3)"); if (param4 != string.Empty) sb.Append("(Colom3 = :param4)"); or if this is in a stored procedure, make IF statements in your stored procedure.

What is the database, SQL Server? I have done optional search parameters like this CREATE PROCEDURE MySearch @Param1 VARCHAR(50), @Param2 VARCHAR(50) AS SELECT COl1, Col2 FROM MyTable WHERE Col1=CASE LEN(ISNULL(@Param1,'') WHEN 0 THEN Col1 ELSE @Param1 END AND Col2=CASE LEN(ISNULL(@Param2,'') WHEN 0 THEN Col2 ELSE @Param2 END