//inserting data into database
public bool Insert(ContactClass c)
{
//creating a defult return type and setting it to false
bool isSuccess = false;
//step 1:Connect database
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//step 2:creating asql query to insert data
string sql = "INSERT INTO tbl_contact (FirstName, LastName,ContactNo, Address, Gender) VALUES (@FirstName, @LastName,@ContactNo, @Address, @Gender)";
SqlCommand cmd = new SqlCommand(sql, conn);
//create parameters to add data
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
//connection open here
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs successfully then value of rows will be greate than zero else its value will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//methode to update date in database from our application
public bool Update(ContactClass c)
{
//create a defult return tupe and its default value to false
bool isSuccess = false;
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//sql to update date in our database
string sql = "UPDATE tbl_contact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHERE ContactID=@ContactID";
//Creating sql command
SqlCommand cmd = new SqlCommand(sql, conn);
//create parameters to add value
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
//open database connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs succesfully then the value of rows will be greater than zero else it's value will be zero
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//Delete Data Method
public bool Delete(ContactClass c)
{
//defult bool value
bool isSuccess = false;
//Connect Database
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//sql query
string sql = "DELETE FROM tbl_contact where ContactID = @ContactID";
//sql command
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("ContactID", c.ContactID);
//Open Connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//Condition check
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//methode to delete date from database
public bool Delete(ContactClass c)
{
//create a defult return value and set its value to false
bool isSuccess = false;
//create sql connection
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//sql to delete date
string sql = "DELETE FROM tbl_contact WHERE ContactID=@ContactID";
//create sql Command
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
//open connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the qury run sucessfully then the value of rows is greater than zero else the value 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
//close connection
conn.Close();
}
return(isSuccess);
}
